I am going to buy a CLK convertible very soon to replace my Volvo C70. I will buy either a 350 or 500/550, just depending on what is available, price, etc. I am interested in 2006-2008. Here's my question. I have been looking at cars on e-bay, auto trader and cars.com just to see what is out there. I have trouble telling cars of the same model apart because I do not know the various option packages like you guys do. For example, maybe 1/3 of 350s have a wood-trimmed steering wheel, but what else does that mean? Do cars with wood wheels also have different suspensions or other differences I cannot see in pictures? Or what can I tell from the different wheels styles? Is there someplace I can go to learn the different option combinations for those years and what visual clues there are so I can evaluate one car against another? For example, if you asked me that question about ragtop C70s, I'd say it's either a high pressure or low pressure turbo based on whether it has a 56 or 53 in the serial number, it either has the in-dash 3-cd changer it doesn't, it either has wood trim or it doesn't, an it either has a trip computer or it doesn't, and it may have 17' wheels. That's about it. Other than the turbo, these are all visual. I get the sense the MB's may have a more complex answer. Thanks.