Posted a couple of pictures the other elsewhere and thought they would be helpful in this thread
Comparing the 500 Sport Grip logo and the "breath though holes"
A close up of a C8WY one
Here are what later versions or at least many look like Notice that the holes are not continuous but in staggered rows. This is what your going to typically find out there. Had a full case of those we bought back in the 80's. Owners/builders will often will often wrap the thin straps over the black areas to camouflage the lack ofholes
Hope this helps