Fastback Trunk Mat

I’m looking to see if anyone has insight on what’s original for a 69 fastback trunk mat. I’ve seen posts that the fastback trunk mats were originally a black pebble rubber and not plaid like the rest, someone else said this may have been 67-8 only. Can anyone chime in? My car did not come with a mat when I got it and trying to put it back too as close to original looking as possible.