Redtop automatic transmission question

[MGB-SR20DET]

Hi- I'm new to this forum.
I am in the process of installing a redtop SR20DET engine with automatic transmission into a 1972 MGB. I would prefer a manual trans, but my wife would like to drive it as well, hence the auto trans. The trans is leaking, and I will need to replace the seals, as well as the filter and pan gasket. How should I go about finding parts? Are the parts common between the domestic auto trans and the JDM auto trans? I haven't found much info on the auto trans, any useful websites out there?
Thanks!
Wilbur

[projectRDM]

Exact same unit as the 89-98 US model 240SX and the 90-96 300ZX non turbo. Only the bellhousing is different. All parts, internal and external, will cross over.

[MGB-SR20DET]

Thanks for the info! I'm still new to the whole import thing, so I'll probably have a lot of questions that may seem obvious to those who deal with it all the time. I've spent most of my life working with small and big block Chevies. I could give cross references from memory on most of those motors, but haven't a clue on NISSAN motors. So every day is a learning experience.