if i may weigh in on this. if the slk roll bars are used on a convertible you need to know if they meet the TUV requirments. this is the saftey rating of parts to be installed in germany and most of europe.
i did a pretty though search of the american sellers and only 1 dealer had TUV approved rollbars. use of "cosmetic only " rollbars may put you in danger if involved in a rollover accident. these bars all look alike but may not be up to safety standards.
just be careful