zoltan wrote:Is there a parts CD out there which one could use to look up factory part numbers?
Hmph.  No.  Well, yes.  Kinda.
I bought this one for a tenth of what it's worth, off eBay about a year ago:
 
  
It's the "final" version of the official 810 (910 in non-US countries) Parts Catalogue.  It's . . . a treasure.  However, it's got a 
lot of pages, and they're of bible-paper weight, so it's not feasible to scan it, even if I had an extra 200 hours or so to do it.
And I've never found another one -- believe me, I've looked!
DML has an 
old, right-hand-drive version of this Parts Catalogue for $20, but it's of limited usefulness IMO, because it probably doesn't cover US-spec 810s.
 
(they actually have four of them: two 1980, two 1981; three of them are $10 ea, the one above is $20)
But for the 720, only right-hand, non-US-spec stuff turns up, 
like this one for $20:

(they've got two of 'em, same price: 1980 & 1981)
If you find a source for either of these Parts Catalogues (C-0380U, C-0350U), please let me know.  I would desperately like to own one for the 720.
I haven't found an effective way to Google for them either.  I do run a canned search for them on eBay, but only ONE has ever turned up since I bought mine -- and a member here missed buying it by 
that much for some reason 
 
 
If I could buy a US-spec one of those for 720 1982-86, I'd pay $50 for it.
[later]
I suppose I could contact Nissan about them.