Narrow Bed 78-A Info Needed

[Dan Partain]

I'm looking for anyone with an original pickup with the narrow bed (78-A), or even just the a narrow bed that has the original bed skid strips. There was a rivet in the outside strips even with the center pan in the bed. If you have just some original strips without a bed, that will work also.
Trying to see what type of rivet filled this hole.
See photo.