I realize this ain't parts sales but it is the SL forum so I figured it was appropriate to post here.
If anyone is interested I've got a complete set (front and rear) of brake calipers from a 1972 350SL that I'm willing to sell cheap. They are used calipers and will need to be rebuilt. I was somewhat surprised at the cost when I purchased rebuilt ones that got put on the car when these were removed. First $75 will get all four and that includes shipping to anyone in the lower 48 states. Let me know if interested.