There is a rather involved procedure for deciding which thickness to use, which requires a special tool, which you can get from AST. I am sure you will find more information if you search on "puck."

Herr Fuchs, my guide in such matters, told me that you want to shim at the high point of tolerance on the tool, rather than the mid point, and that has worked well for me.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe