Petegtsv10

It was easy enough to figure out which 15mm H&R spacer to order. I followed the info in the chart showing how to measure for MBZ-specific bolts, but was told by H&R that I was wrong. He had a completely different interpretation as to how to measure for the 15mm longer bolts. Does someone here have the H&R part number for the bolts they purchased?

AMG 17GT

my invoice shows 40mm non H&R bolts.

Petegtsv10

part number?

slk55er

I ordered these 60mm bolts via Amazon Prime for an application on my GLC300. They may be OK for your situation, but they do not have the floating flare as on the head of the original GT S bolts.

AMG 17GT

no part number listed.

Brian at supreme power 714 632 1951;225 got them fo me.

okbarnett

whatever your original bolts are, add 15mm
easy

Petegtsv10

Not that easy. H&R has different methods for measuring different bolts. A 45mm Porsche bolt isn't the same length as a 45mm MBZ bolt!! Turns out one is full shank length and the other is exposed length beyond the floating spacer. Also, their floating spacer isn't the same thickness as OEM. Bottom line is their 45mm bolt is about 15mm longer than the OEM bolt that I measure at 45mm. The big problem, and the reason for my post, is that H&R couldn't communicate all this very well on the phone and their measuring diagrams don't include MBZ.

okbarnett

Take your original bolt, it shows on acer it is a 29mm (30mm), add a 15mm spacer, add 15 = 44mm (45mm) bolt.
30 is common to almost every porsche and mb.

or take your original bolt, measure the shaft from the washer, should be 29mm, add 15 + 44mm bolt.
You have an original bolt that fits. You add a spacer, you add that thickness to the bolt.

https://www.acerracing.com/ball_bear...4aArDrEALw_wcB

sl600fanatic

Agreed with OKBARNETT, the ACER Racing +15mm Titanium lug bolts are a OEM fitment, wont corrode, and are half the weight, I used them on mine. And the price is right too:
https://www.acerracing.com/ball_bear...-1701-128.html