he told in his other thread that it is a 91- fork..
you have only to measure out the diameter of the lower fork tubes to find out which seals would fit.
1990 is 41mm fork.
91- 93: 43mm with blue legs,
94-95 (kx125/250) kx500 -96: 43mm with legs in champagner colour . same color like the 46mm fork that came in 96 to 125/250 and 97 to the 500
what is stamped on the lower side of the upper fork clamps? kx125 , kx250 or kx 500 ? 125 upper clamps are one peace with the handlebar clamps ... 250 and 500 have the handlebar clamps bolted on the upper fork clamp ...