I made three different sizes:
0.30mm
0.40mm
0.50mm
then I put different combinations in and fitted the swing arm pivot, felt the play, removed the pivot swapped shims and refitted untill I was happy with the feel.
I had nearly 1.10mm of end float, and from memory put in 0.90mm of shims to allow the swing arm to move freely with as little as possible end float.