I test fitted that full width rear mat in a '66 Chevelle, I just can't remember if it had bucket seats or not
The Caprice I was going to use it in did have buckets and a console and I was going to have to trim the forward edge of the hump to use it in that car (there was a visual mold line that would have worked to trim it to), otherwise it fit nicely. Hopefully someone chimes in to confirm whether that full width rear mat works with buckets without trimming.