Wonder what the reasoning was going from narrow to wide vin pad, other than more room... Seems safe to assume, more narrow vin pads were seen on lower vins and as production went on, more wide vin pads were seen than narrow. Imagine at some point, narrow pad cases quit being cast and wide pads took over. But, when it came to one or the other, seems the guys stamping the vins did not differentiate narrow from wide as far as numbering sequence was concerned.