Found these little blue items on Ebay, cheap at $10.25 minus shipping
They seem to be made of alloy though.
No idea how they'd bold out in the long run, probably nowhere near as well as the stainless outdrives or MIP SuperDiffs.
Even so, a nice cheap fix for the RC18T's crap outdrives
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Second place is the first loser
Mondo have you dealt with them before? They have some of the new Ti. parts for the Half8 that were just released. A bunch of stuff for the RC18 too.
Only thing is they are in HK, which takes a bit longer to get here. Hopefully they are good to work with. I may have to order some stuff from Hong Kong again