Join Date: Dec 2005
Location: Texarkana , Texas, USA
Model: 88 GL 1500
Yes, the 88s have diagonal slotted holes.
The rear rotor on an 88 is smaller in diameter. Many like me, upgrade to the larger rotor and we would have hadto change the caliper bracket.
I do not know if there is a difference for the front rotors, but the 88s fronts rotors are also slotted.