incorrect camshafts?

[erubin]

My car is a 1972 450SL.
Vin # 107-044-12-002644
Engine# 117982-12-002659

The camshaft codes stamped on the rear of the cams are 52 for the left and 53 for the right. I need to change the right cam as it has two scored lobes but the FSM does not agree with my cam codes. Should I replace with same cam (code 53) or replace it as listed in the FSM with camshaft code 55 or 57. Will there be a missmatch with the left cam or is that not a concern with this V-8?

I don't know how the wrong cams got into this engine. Maybe the original owner had this done. He sold the car to us in 1976 with few miles on the car. Or did the MB factory make a mistake and put 52/53 cams in this car by mistake? The car runs fine. Which cam number should I replace the right side cam with? Is all this trivial and there is barely any difference between these cams?