originally wiith the exception of early 230SLs the rim side increased to 6inches to allow for more tire tread for better handling. theses rims come off a 300SD sedan and will fit our carsl they weight 10 pounds each instead of the original steel wheel that weight in at 40 pounds each a big decrease saving in weight and handling. One thing you must first have the rims checked for any flat spots that could cause problems see Michael Salami articlel Pagoda Times. a very in dept artical using state of thee art hunter balancing machines.
I did fine I need a dermal tool to increase the round opening to adjust to the hub. No one wands to have to be stranded because the road wheel is stuck no fun.
So their is my comment sand 10 cents for a cup of coffee.
happy holidays and a safe new year.
Bob Geco