You can also use the 1961-64 f-100, thru f-350 cab. The f-100 & f-250 cab has the battery access stamped in the floor but it isn,t cut out. Also the transmission hump will havt to be cut and you can use your transmission cover over the hole. This will give you a few more years to choose from instead of limiting yoursekf to just the 65-66 model. Have fun.