A855 - 5 Speed

yellow rose said

They want you to measure the crank flange and the bell housing bore.

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No, no, transmission input bearing retainers.

Browell Bellhousing Custom Builds Aluminum and Steel Bellhousings

As to the bell housing centering jig, mandrel, fixture, I can't see it being accurate to much more than about 0.002" (0.001" offset) as it has to be a slip fit. But there's no denying it'd be faster than using a dial indicator.