1964 C10 long bed rubber mat sizes

[akqj9]

I am looking for a rubber bed mat for my 1964 fleetside longbed. There are lots out there but some companies don't list 1964 sizes. I want the mat to cover the full bed and need the fender cutouts to fit well. Do the later models have the same shape or will using something like a 1990's longbed mat not fit well? Are the next generation 67-72 shapes the same as 1964? thanks

[OldGMJon]

the wheel tub cutout is a little longer than the 64's so you have gaps on either side.