going to change to a 4spd in my 67 cutlass supreme looking for diameter of shifter hole and measurements where on the tunnel to cut bucket seats no console thanks in advance for any help

 

There is a hump that gets welded to the floor that accepts the rubber shifter boot. Do you have the Hump? Olds humps are wider because of the factory Hurst shifter they used. The Chevelle hump is reproduced and can be widened to duplicate the Olds hump. Its better to mount your trans and shifter and fine tune your cut so in neutral the shifter is pretty much centered in the hole.

 

 

 

just what i was looking for thanks for taking the time to reply , photos are great!!!