Your best bet is ebay. You will need the retractors as well.
You can buy the seatbelt mountng bolts, the hanging / guide clips from most any supply house but you wont find any seatbelts (like the originals). You'll have to go to ebay and you will find complete sets for 69 mustang on there.
You can buy the seatbelt mountng bolts, the hanging / guide clips from most any supply house but you wont find any seatbelts (like the originals). You'll have to go to ebay and you will find complete sets for 69 mustang on there.