Ronnie, just as a suggestion, (although you've likely already tried),
try and obtain a technical or service manual for the system. Many of
these will included a cross-reference from the manufacturer's part ID
to a and industry standard.

Even a Sams folder would help you here, if one was ever published. Nice
thing about Sams folders is that they almost never go away once
published, only become a bit brown with age! :-)

Harry C.