To be clear, the number Ronman keeps pointing to is the SLA "assembly" number, which probably came on a sticker that was affixed to the bag carrying the SLA on the production line. The numbers on the parts (like PP170-267-054) that make up the assembly are valid Mercedes part numbers (obviously since they are printed right on them), but you couldn't buy them separately, so they don't use the -xx -yy number convention, but a single 3 digit number. Some available parts that were sold separately had an extra 4 digits, like the shifter **** 170-267-11-10-1A84 ( Search Results | Mercedes-Benz USA Parts (mbusa.com) Most are discontinued, but trim pieces are also available are there.) Yes, Chrysler has/had its own parts numbering system, and it probably was cheaper to use a sticker with their number on it then change the Chrysler Database pneumonics or the Mercedes factory stamp. For example, on 2004-2008 Chrysler Crossfire Transmission Shifter 5114036AA | Mopar Factory Parts, under 2005 crossfire, the part number for the SLA assembly is 5114036AA, whereas on Pelican auto parts or mbusa, the part number for a SLK320 SLA assembly is 170-267-08-24 or 170-267-11-24. Interestingly enough, pelican has the -08-24 version for sale at $620. I was confused by the PP (thanks for setting me straight on that) since reading the blogs about Mercedes numbers says the first letter should be "A" for passenger car, like the RCM is A 170 545 03 05, or the TCM is A 033 545 11 32. Maybe that convention is only for the assembly part number (?) and the plastic identifier is for the part level (?). But regardless, the fact remains that if you try to find a used SLA on ebay or on junkyard sites, most will have it listed under the PP170267054 part number since that is the most prominent number visible on the SLA.