I have not seen these styles in a trifive before. My main concern would be that they may be too high and stick up higher than what is normally done. The second issue might be that they are too narrow to look good in that car. I would get a width measurement from them and one from the old Impala style folks have been using.
I think one of the most popular bucket seats for the tri-fives are those from the early 60's Impala SS, Gto's, Corvair's and Buick. They are all very similar in size with a low back and most of these have the Chrome trim band around the seat backs. I had 2 sets of these but just sold one set and am planning on using the other set complete with the 1963 Super Sport console. Check e-bay as they come up once in a while. I looked for two years for mine! If you choose to go this route be sure to buy a set that is complete with the trim and the tracks as these are hard to find and are costly to buy separately. BTW I bought and sold a complete set for what the guy is asking for the Camaro seats.
Those are actually 4th Gen seats someone installed in a 3rd Gen..Its a popular conversion many people do...The leather is known to not wear well if not taken care of properly but other than that they are a nice seat.
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