Thanks for the write up, greatly appreciate it! So i went to check out the wheel and it said 7 1/4(it could have been 1/something else, it was really hard to make it out) jx16h2 ET17. Is this wheel size for an SUV? Is it possible to fit these rims on to 92 SL500 r129?
what you have seen already by looking on all 4 wheels. Most likely it reads 7 1/2J x 16H2 ET??. In addition try to get partnumbers off the wheels as well, just to confirm what they are. Those numbers can be very hard to read sometimes, depending how they were painted.
I'm surprised to see an ET of 17, kind of low and not compatible with many Benz.. certainly not an SUV wheel if 17 is correct. I really thought it would be 31 or 37, I have a similar set that is clearly 40 with the paint removed. The SUV types are all bigger numbers by far,,,upper 40's, 50's & 60's...
ET17 wheels will stick outside of the fenders on a car built for ET60. The lower the ET number the more the wheel moves outward, and higher the ET number pushes the wheel towards the insides of the car. That is why knowing the ET you need is so important, keeps you from rubbing the tires on the fenders or worse, hitting the suspension in the other direction.
Each car is designed with a certain et range in mind, you can swap wheels from one car to the next only if the swap wheels match the ET design of your car. W124's for instance are ok with wheels in the ET range of mid 30's to high 40's, (with some exceptions), so a et17 wheel is no good on a W124.
As far as a 129, an et of 17 may work, but it seems a little low-17 is more of a 107 & 126 fitment...see this link that shows most benz wheel sizes, including the et's.
Alloy Wheels Direct Ltd | Fitting Chart Index
If you can find partnumbers that are clear enough to read, post them back here as well..
PS: the company in that link has just about any AMG wheel in stock.. not a cheap date as they deal in retail price and they are in the UK, but they do have almost any MB wheel made
PPS: I just looked at that list in the link, and it most likely is an W/C 126 AMG wheel, see attachment. Verify what you have to be sure, and now you know exactly which of the Aero I wheels you need to find, (needle in a hay stack). I looked at Alloy Wheels offering for 126's, and they don't even list it. Get the partnumbers to do searches and I would call Alloy Wheels up with the info to see what they can do. Also, try eBay in Germany, they have lots of older and hard to find Benz stuff there.