I always check with Needswings.com first, since they do a super job of supporting our cars. That said, I also buy from moparpartsgiant.com. They list this "pad sill jack button" (part #5099715AA) for $21.89. Also see if you can find the MB part # for an SLK320 and then check on-line for that. As you may have already found, MB parts that are common to our cars are often lower cost. Hope this helps.