Another VW resto thread! Good!!
Contrary to what everyone's been telling you, these are original 1974 vintage seats. I strongly recommend you do NOT change them. Vitz seats or corolla seats, no seat fits better than VW original units.
You do need a set of plastic bushings to restore the sliding mechanisms. Unfortunately these are available as a kit abroad only. Cheap to purchase but expensive to get across. You may be lucky if you have family/friends traveling to Pakistan.
Original VW seats are interchangeable between the following years......early to 1970......1971 to 72.......73 to later........there were three styles of sliding mechanisms.
I have this fear that the denter you have engaged is not experienced with VWs, else he would have told you these were the original seats......or maybe he wants to avoid any 'extra' work and just slap on some Jap units.....typical....