I think you'll struggle to find anything for that engine, afaik they never marketed them in europe. There was a company over in Japan selling parts internationally for the 420/370 sti engines & hydradrives that were marketed over here
I do know a guy who bought parts from them but it was a few years ago
A quick google looks like they have parts diagrams for it but whether they have parts or not is anyones guess worth a try
https://en.impex-jp.com/catalogs/mar...984-26512.html
I used to import cars from japan & found generally the Japanese were good to deal with & very honest. We used to send 10'sofk's over for vehicles we'd only seen pictures of & had a basic description of & never realy had a bad deal with them
