Are these factory seatbelts? Need help identifying please

[wugunguy]

Been doing some cleaning and organizing around the shop to make room to start working on my truck again and have come across several boxes of seat-belts and need help identifying what each goes to and what makes a complete set. I have been away from the trucks for quite awhile and can't remember where I got all these.?.? Any help will be greatly appreciated! Thanks in advance.

The 1st box consist of these and I think they may go to a 69-72 Blazer but am not sure. Is this a complete set?












The 2nd box consist of these and I think they are shoulder & lap belts but not sure if they are for 67-72 Trucks?.?.







The 3rd box consist of these and I think they are for a 67-72 Pickup. What makes a complete set?