KenSilver, I think your SL looks pretty great now it is colour matched. A girl who works near me has one in blue black metallic with mushroom leather. She too has had the bumpers painted. She has a set of (subtle) 17" Lorinser wheels on it which are a lot like the AMG 18"ers. I wouldn't go further than that. (Aside: This girl is both gorgeous and single. What am I doing here?)
The 1995 body mods are more than just the change from three vents to two. They are quite difficult to do. As well as the panel on the front fender/wing with the vents in it, you would have to change the door panels and the rear wing panel because they are a different profile. The bumpers are different, too. The rear bumper can be swapped out, but the front bumper has different mounting points. The car can be adapted, but it requires welding. Yikes!
A guy who used to post here a lot called Steve or MBenzNL did the changes to his car. His website (largely concerned with his C250 diesel) contains details as do some of his posts here:
www.mbenz.nl