Joined: Jan 2011
Location: Rochester Hills
I have the Boss knob, GT500 shift boot, and e-brake boot in my base GT. Compliments the GT or GT500 steering wheel nicely. Back to your question on the shift boot:
Step 1: cut off the tab on the underside of the upper ring. I used a sharp pocket knife.
Step 2: Test fit the ring over the shifter shaft while holding it upside down. If it fits, simply reassemble. If not...
Step 3: Get a pocket knife with a sharp blade and stick it in the hole until the blade touches the plastic. Gently rotate the blade all the way around the inner diameter, letting it remove the mold parting line. A tapered round file would do the same if you have one.
Step 4: Test fit and repeat until the ring slides over the shaft without binding and sits flush with the step in the shifter shaft
My shift knob was not rock solid on the first try. It rattled at 5-6k rpm. If you have this issue, I recommend plumbers tape or gas line tape (thicker, yellow thread tape). It was a bit of trial and error to achieve a very snug fit and proper alignment of the knob shift pattern, but now it neither vibrates or rotates from daily usage.
2011 Kona Blue 300A - 6M - 3.55 / Koni Sport Dampers / Whiteline LCA's / GT500 Mufflers