I just installed a new floor mat in my 1951. The "punch outs" that they had on the back of the mat fit well in some spots but not in others. I find this is the case with most aftermarket parts (especially if you have done work to the cab.
To fit mine I took out the pedals and set it in so it looked correct on the floor (no gap). Some of the punch outs fit perfect (dimmer switch) while others like the top clips did not. Since the "punch outs" were not visible from the top and sturdy, I only used them as a rough guide and cut out my own holes using a razor blade. To make my holes I started with a small hole where I thought it needed it to be and widened it until it was close to the right size. I then took out the mat and cut the final shape with the mat on a bench to get a nice clean finish.
