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FC stat gears bearings only come in two sizes from Mazda - standard and oversized.
Oversized is for those who have a "clearanced" eccentric shaft due to machining in case of warpage / damage.
Unless you have the tools to "mic" the eccentric shaft - v-blocks, run-out gauge, calipers, etc. - just get the standard bearings.
Most people should just get the standard bearing.
Mazda went one step further with the FD stat gear bearings - that's why there are several (+ and -) to account for variations in production tolerances and for slight clearancing machining.
(I think it's something like one or two undersized, one standard, and the rest are oversized.)
I guess they thought clearances on the stat gears was that much more critical on the 13B-REW engines...
-Ted
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