Anyone seen these seats before???

[slb1985]

went to my local u pull it just to look around and seen these...they r what i wanted my seats to look like but dont know what they r from or if they will fit.. the pics that have bolts in the slide are bolted what appears to be factory location on the driver side but the slide is missing off the pasenger side but if they bolt up to factory mounts can i use my exsisting tracks? oh yeah they r sitting in a 79ish sierra grande dont know if u needed it or not... any help would be great also what might the be worth so i dont over pay and maybe feel like i get a deal if i under pay