There's an attempt at a group buy on OEM 80 throttles on Mud. But the queue is currently at 100+ and the guy has about 10....
Japan4x4 says he can get them for around $60 I think.
This is probably all irrelevant since I'm sure you're after 40 parts....
1976 FJ40 - green and mostly stock
1996 FZJ80 - not so stock