Just wondering why it's listed as only for 91-93? Axle splines the same?  
That's very odd!
Year   Bolt Count    Spline Count     ARB Locker Model
FRONT
89-95     10       22                 RD75
96-98     10       26                 RD88
REAR
89-93?     10       26                RD74
94?-98     12       26                 RD79