your oem clutch plates are the best to use and are good for 300kmiles.
when my damper went bad only the plates on either side were bad.
Some info, bought a complete used clutch assembly on ebay for $40, price ranges found $40-100+. this way I had a clutch basket, which greatly helped in assembly. This was from a '91 Goldwing 113k, mic'd the clutch plates and actually measured that same as my 42k plates and the two new ones. so basically the clutch doesn't wear out. I can see why GL1500 forums state clutch is good for 200-300k miles. From checking parts fiches ALL GL1500s use the same number of clutch plates, so basket and clutch center are all the same. what is different is the clutch plate design and materials. Up to '97 all the clutch plates are the same except #4 and #7 which are actually the same that all '97 and up clutch plates are thus the upgrade mentioned for valkyries and 97-00 goldwings. Embossed on the pressure plate states they are paper disks.
The 113k damper plate looked fine and had the same slight movement as the new one I bought.
Also it is noted that OEM clutch plates will last approx 300k miles even with a GL1500 GW being fully loaded and pulling a trailer. and in '97-00 the clutch was upgraded in all GLs to match the valkyrie clutch.
http://www.valkyrieforum.com/bbs/index.php/topic,71364.0.html