First of all, I'm sorry I didn't get back to you yesterday like I said I would. The computer I was using was borrowed & they needed it back. I went & rented one. Anyway, I've got a 67, had 3 on the tree, converted over to hurst floor shifter. From the back of the tunnel where the rear seat metal meets the tunnel go 56 3/4 to 59 3/4 and go from the edge of the tunnel over 2" for the width the other way. Works on my 67 with that shifter & the small boot. If I'm not making any sense on where I measured from, let me know & I'll try to explain better.