Hello, the $49 bars do not have the extra tab hardware for the little rear window to attach when top is down. They are a direct bolt in on SLK 320/ Crossfire Coupe but require time to slide into position because of the Coupes low roof. I have no skills so I have a shop that will perform the work and Guarantee it. I got my Bars on Ebay for $79. I over paid it seems.