Fleetside bed mat

[Mike66C10]

Hi. I'm looking a bed mat that would fit a 66 C10 fleetside. I have a short bed, but I can cut down anything that would fit.

Has anyone tried a 67-72 mat in a 60-66 fleetside? It's tough to find dimensions of truck beds, not just L x W but where the wheel arches are, or id just compare measurements.

I read posts about mold growing under mats, but this is for temporary use for hauling stuff.

Also, if you don't use a bed mat, what do y'all do to protect the bed wood when you're hauling stuff? Sheet of plywood, cardboard...?

Thanks for reading, and for any ideas.