The reason to use the FMS gears, besides being the best, is that they are machined to be assembled on an assembly line and they don't really have time to go over everything with measurement tools. The shims that are already in place will likely be the correct ones for your new gear. Check your mesh pattern, of course, but it's likely going to be correct.
Changing gears is one of those things that a lot of people believe is more of an art form than mechanical. That's just a perception that people probably get from the difficulty involved with installing third party gears. It's not that hard.
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