Roller cams didn't have the bosses in a different place from cantis did they? Weren't all the MTB forks the same model Tange, at least in '87? The '86 forks all had crowns I think. The '88 forks were still Tange unicrowns but I don't know if they had that reinforcement on top of the blades. I don't remember my '89 having the reinforcement.