EB, I think the 60-62 GMC burbs have the same setup as the Chevy's. Keyhole shaped holes in the floor for carriage bolts to slip into. 63 was the 1st year for the tracks. Brian


My \'64\'s in the Gallery
Pictures in my Photobucket
1964 C10 Custom Cab 350/700R4
1964 Suburban 350/700R4
1979 Ford F350 4x4 400/c6