They'll fit, but the seat tracks are different. So you'll either have to remove seat tracks from the 72 pans and weld in the seat mounts from your 75, or change/ modify your existing seats. Most parts are interchangeable between the years. Is it a Beetle or a Super Beetle? If you want to use pre 67 hood, decklid, and fenders, you'll need to change the front/rear aprons.