The 84-89 Nissan Maxima utilizes the same clutch kit as the S13(and presumably S14) clutch. So the parts are the same.
Everything in the three kits is the same (pressure plate, release bearing and pilot bearing) except for the actual discs. A 6 puck silvia disk 6P240F is $96.00 (retail). The kit number is NS1-HDR6.
You can get them from numerous places:
http://www.srswap.com/http://www.enjuku ... co....html
Id find more but my internet is going slower than a 14.4 on crack. Coincidentily I have a new in box ACT 6 puck disc id sell for less than half price but I dont feel like shipping it. Besides its no good without the pressure plate anyways.