From google, I hope this helps in what you are looking for
http://www.pdm-racing.com/products/suspension.html
From the page close to the bottom is this:
S14 MOOG Front Lower Ball Joints - K9820 . . MSRP $66.54 Sale $53.57 USD each*
This seems to verify only somewhat that your part number is correct. But you indicated you are looking for the rear joints. Some more goolge yielded this, but no part number. And its a shady looking thread
http://www.nissansilvia.com/fo...88290
Saying this towards the top of the thread:
S14/15 R32 Rear Ball joints Priced & Sold Each $37 ea
And there in lies my sad sad google skills. Cant find a part number for those rear ball joints. Plus only the fronts with the part number K9820 show up on moogs suspension website