Another Bucket Seat Question

[rd237]

Hello Everyone, I got a old set of bucket seats with the buddy seat in the middle that was in a 1959 El camino I bought a few years ago. I don't know what they came out of. The seats themself look like any of the ones that came in some of the C-10 trucks or blazer's but the frame on the bottom of these are (square tubing) and not round. They do look factory. Can anyone tell me if anything like this came on any of our ride's. Thank's