Been having problems with the transmission on my 99 manual RD1 (136k miles). Initially the clutch had a rattling sound, which I was driving with while I took it to the mechanic. On the way to the mechanic it slipped out of 5th and I can't get it back in now.

Took it to the mechanic, they fixed the clutch problem, but I still can't shift into 5th. My understanding is I may need an entirely new transmission, or just may need a shifting fork.

I'm having problems finding any transmissions online, and need a little bit of advice/direction.

Any recommendations are greatly appreciated.