Can't help you with just the disc, but I can tell you if you end up having to replace the whole thing, do yourself a favor; only buy a NOS one. I made the mistake of buying an aftermarket OEM one twice because of convenience of being available at local parts store. Junk, junk, junk! One melted my wire harness after about six months. The other failed within six months. Neither operated as smoothly as the originals (which lasted over 20 years) from day one. If you keep your eyes open on Feebay NOS ones pop up for $20 to $25 range. Good luck.