[Tristan Lall]

It depends on the model. If you're considering using the ones provided in the kit last year, it has been mentioned that these are no longer available from a legal vendor (verify this for yourself). That makes them non-COTS, and specifically illegal if they were originally made for FRC (per <R36>). If they were not FRC-specific, then they can be used if unmodified, since they were previously COTS parts. I don't know whether FIRST made a custom order for those parts, or if BaneBots was previously selling them anyway, so you'll need to find out which case applies to you.

If you're looking into something in BaneBots current product line (which includes improved versions of the gearboxes donated last year), then it just needs to meet the parts utilization rules (like any other purchased item on the robot).