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For the prefilter under the hood it is Mann Filter CU 19 014 I got it on Amazon for $13 despite Amazon insisting it doesn't fit the car. See attached photo of the original filter I removed. If you zoom in, you see the Mann part number next to the logo. I'm awaiting the glove box filter and will update when it arrives.
Sometimes you can locate the OE p/n online at distributors such as Pelican Parts, Autohausaz, etc. where it will listed as a substitute for the MB p/n.