I thought that the RA65's had W57's or W58's? (I'm guessing your going off the plate tho?!)
Also if you do a search for something like speedo gears or something there is some good info. I remember a listing of teeth numbers and what gearbox/diff ratio they came out with. Might be easier to ask for a specific number of teeth on the gear you want
(also the fact that there are two different internal gears that mesh with external gear you want might effect you, I'm not sure what your plans are...?).
Also pretty sure you can get them from toyota as well for around $30? if it comes to that
well basically i got a w5x from a gx81 and it has stuffed up my speedo reading .. originally a 255 with F372 axle .. so i guess i need to get the original speedo gear to plug back into the new box.. is that not right ?
$30 from toyota what the !!?? let me give them a call
Might be an idea to check that you have the same number of teeth on the gear in your new gearbox as you did in your old! (there is a gear on the output shaft that drives the nylon gear, and there are two different types, they have a different number of teeth, 10 vs 11 I think, this will also effect your speedo).