Sorry mister but ace forks are conventional right way up same as the early exup 89& 90. Also from memory the genesis 1000 forks were 41mm& the89 are 43mm. The later ru may be 45 ...but I,ll stand corrected on diameters
T-Ace forks are right side up and 48mm. You can probably make them work in the FZR if you were to swap out the whole triple tree, but not sure it's worth the trouble.