In short, kx500 steering bearings are the same from 83-04.
Upper bearing:
FITS 84-87 KXT250, 74-76 78-91 KX125 KX250, 83-04 KX500, 75-76 KX400, 80-81 KX420, 78-84 KL250, 80-84 91-94 KDX250, 83-06 KDX200, 97-05 KDX200, 79-80 94-96 06-10 KLX250, 93-96 KLX650R & C - 92047-017
Lower bearing:
FITS 74-76 78-91 KX250, 80-81 KX420, 83-04 KX500, 83-94 KDX200, 81-84 KDX250, 84-87 KXT250 - 92116-1008
There was also some street stuff that I deleted.