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HELP - Got the Wrong Rear Dome Light Festoon Bulb Size, Please Advise!

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Old 11-03-2009, 07:08 PM
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LOADED 08' C350 & 14' GLK-350 Diamond White (P1, MM, AMG Pkg, Ln Trkng, Htd Sts, Keylss Go)
Exclamation HELP - Got the Wrong Rear Dome Light Festoon Bulb Size, Please Advise!

Somebody in the Interior Bulb Change DIY told me to get the M-28 Polarg Festoon Bulbs for the rear dome light... WRONG... too short!!!


These are the ones I tried to put in, but the bulb is too thin and too short:



DO NOT GET THESE... I REPEAT, DO NOT GET THESE... too small for the rear dome light...

There, I wish somebody would have told me that... the search function really sucks these days, nowhere could I find out what exact bulb size to get...

NOW, can anybody out there please advise me on what the real size is to get for the Rear dome light if I want a polarg festoon style bulbe back there????


thanks in advance, sorry for frustrated tone, but now i have to have my rear dome light hanging out for the next few days till i get the right bulb
Old 11-03-2009, 07:24 PM
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Just look for a polarg that's 40-42 mm.
Old 11-03-2009, 07:34 PM
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Originally Posted by Richard2011
Just look for a polarg that's 40-42 mm.
where, there are none on ebay that are polarg in the right size...

havent people done this mod with a polarg? can someone just please post a link to what they used that will match with the polargs used in the front????

this is so frickin frustrating finding this damn rear dome light bulb....
Old 11-03-2009, 07:44 PM
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I've researched this before, and I've read that the prongs are pliable. So you can adjust them to fit the bulb, but I don't know for sure.
Others just put an LED there. It's the same color.
Old 11-03-2009, 07:46 PM
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ya i dont wanna mess with the prongs, might as well get the right sized bulb... and i dont want an led either since i like the way polargs look in the front already...


i have polargs everywhere except this damn festoon bulb...

i guess polarg does not make a 6411 bulb???
Old 11-04-2009, 01:04 AM
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I tried an LED festoon bulb that was 38mm (1 1/2") and also had to adjust the prong to compensate. I had to return the LED because it was making a buzzing sound.

The OEM festoon bulb measures 44mm or 1 3/4".
Old 11-04-2009, 01:16 AM
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Originally Posted by louiet3
I tried an LED festoon bulb that was 38mm (1 1/2") and also had to adjust the prong to compensate. I had to return the LED because it was making a buzzing sound.

The OEM festoon bulb measures 44mm or 1 3/4".
i measured today the oem bulb and it was 42 mm
Old 11-04-2009, 06:48 AM
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I'm pretty sure the site I ordered mine is called automotivelightingusa.com or autolightingusa.com.. I'm trying to check 4 ya but my bb sucks rite now.. Anyway, when you search under festoon bulb they ask you small medium or large.. Get the large 1 I made the mistake of getting the medium! Get the large 1.. If anything google "large polarg festoon bulb" search you'll find it!
Old 11-04-2009, 10:32 AM
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Finally !!! Somebody actually gives useful bulb information!!!

I will now confirm
for all those who may be in question, if u want to do polarg all the way around, the rear dome light bulb is the M-88 size. That is all you need to know.
Old 11-04-2009, 02:44 PM
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Originally Posted by rb23lb
Finally !!! Somebody actually gives useful bulb information!!!

I will now confirm
for all those who may be in question, if u want to do polarg all the way around, the rear dome light bulb is the M-88 size. That is all you need to know.
Were are you buying them from? Let me knoe I had the same problem
Found it thanks

Last edited by Frnakito71; 11-04-2009 at 02:53 PM.
Old 11-04-2009, 03:29 PM
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I've seen the M88 polarg come up while I was researching polargs on here.
Tell me if it fits when you get them!

This site says there 44mm. Too long?
http://www.automotivelightingusa.com...roducts_id=547

And Amazon says they're 52mm! What?

Last edited by Richard2011; 11-04-2009 at 03:35 PM.
Old 11-04-2009, 04:08 PM
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Originally Posted by Richard2011
I've seen the M88 polarg come up while I was researching polargs on here.
Tell me if it fits when you get them!

This site says there 44mm. Too long?
http://www.automotivelightingusa.com...roducts_id=547

And Amazon says they're 52mm! What?
I just order my set, I will let you know
Old 11-04-2009, 11:46 PM
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Originally Posted by rb23lb
Finally !!! Somebody actually gives useful bulb information!!!

I will now confirm
for all those who may be in question, if u want to do polarg all the way around, the rear dome light bulb is the M-88 size. That is all you need to know.
glad i can help.. i ordered the mediums assuming they would work.. i was wrong! but honestly i was frustrated and in a hurry like usual, i just bent the prongs and made it work.. soo far soo good.. but you should have no problems at all with the xL bulb good luck
Old 11-05-2009, 01:34 AM
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Thanks for the model number. I've had a lot of difficulty finding anything in the proper size--polar G or LED or whatever. I'd kinda like to get LEDs to match the front, but polar Gs would be better than stock (and cheap).
Old 11-08-2013, 07:02 PM
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Rear Festoon

Measured mine at 1.665 in or 42.219 mm. I got a 44 of ebay ill let you know how it fits. Looking at the socket, the contact is easily adjustable. IMO go bigger.

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