Help with barracuda seats!

Yes different widths. Not sure on mounting points. I have a rear notch seat but its buried in the shed right now.
so you don’t think the 69 fastback rear seat will fit in my 67 notchback. I can weld up brackets and make them work but if it’s to wide that could be a problem. Have to get new foam and upholstery anyways so I guess that could be changed to haha