R32 RB26DETT Parts numbers:
15191-05U11 Bolt-eye, Water Tube (2 per vehicle)
15193-03E00 Gasket- Eye Bolt (12 per vehicle *used in more than one place*)
Same on R33 and R34 RB26DETT. not the same on RB25DET's
the 15193-03E00 number is available from courtesy parts, and also cross-references with part number 15188-AZ32T which is "Eye Bolt gasket for Z32 TT Water Inlet Tube Assembly"The eye-bolt itself should be available at a nissan dealership. Just keep forcing them and telling them that if one nissan dealership can do it, any one can.
EDIT:
http://www.getjdmcars.com/catalog/index.php?main_page=product_info&cPath=99_68_85&products_id=633
It's listed on this website. Contact them, they should have it
Let me know if you need anything else