low gearset 904?

what my best bet for gathering the parts.. i have a few good std. 904 transmissions laying around that can use. is it better to just find a non lock up version? if so what am i looking for and how do i identify?

the friend that does my transmissions says i need:
pump
direct drum
sun gear
sun shell
front planetary and ring gear
forward drum
3 ring non lock up input shaft.


does that sound correct? if so where is the best place to source this stuff?

thanks in advance guys.