Yes the spring top plate was revised at the 1994 model year change from I think 81m to 60mm pig tail diameter and this has been common knowledge since the mid 90’s.When we were the importer for Weitec we used to supply very comprehensive instructions detailing the changes required, it is a subject I could go into in great depth but it would be very boring for everyone else although it is worth pointing out that the dust sheilds also changed but look almost identical, it is odd how knowledge gets lost in such a short time.