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Likely m3 … maybe 5-8mm length? At least on my rep2s…
Most M4 screws should fit this bar, if that is it’s like all the other bars in this generation.
I think Fargo printing sells them.
Yep, Fargo sells them: https://www.fargo3dprinting.com/products/front-fan-bolt-for-makerbot-replicator-2-2-pk/ 17
M3. About 8mm or so. Length is not super critical.