Full Frame & Super 35 Shims for EF/RF/PL/L/E Mount

The shims are purchased based on the bayonet, not the focus length.

Focus infinity is not precisely on the mark ?

Answer:   It's not an issue really as each there will be difference of flange distance between different camera, you might find that in the process of focusing the infinity mark might not be  line up with the scale, maybe somewhere before or after the scale,which wont hamper the use of focusing, but if you want to adjust the infinity mark to align with the scale, you can do it from adjusting the shims at the bottom of the lens.