1998 SL500 Black on black
i appreciate your quick and thorough reply and help. Even though we’re off topic from lowering the car, this is huge as well.OK, looks like you understand somewhat now, your observations for lug bolts is correct, but to be more specific for "clearing the Rear Parking Break", the length of threads sticking out of the back side of the wheel, (any Mercedes wheel), should be 17mm to 20mm, or about 3/4". At least 17mm to make sure enough threads are engaged for safety, and no more than 20mm to clear the parking brakes. Also with spacers, you of course need to add in the width of the spacers as well.
Here is a link to Otis, unfortunately it appears they are out of stock on the different lengths of 12M R14 bolts, call them to be sure.
See the attachment for a simple drawing of how to measure correctly for bolt length..
PS: just looked at that Otis link again, looks like they have one size left, 55mm length, maybe they can cut them down to the exact size you need, call them and find out.
I’ll be taking FatherTimes advice about HR springs and smaller cups. I’ll probably end up getting the fenders roll so I don’t rub.