3 Point Seat Belt Hook Up 67-72 Chevy Trucks

[GOPAPA]

1. What years of our Chevy Trucks ( 67-72) have the threaded bolt hole in the cab corners for a seat belt hook up ?

2. Did any of our trucks come from the factory with the 3 point seat belts, or were they dealer insatalled ?

3. Has any of you seen NOS bolts for the cab corners ?

4. Are there any parts places that carry these bolts specified for the 67-72 Chevy Trucks ?

5. Were the bolts painted the color code of the truck if in fact they came from the factory installed, or dealer installed ?

6. From what other years of Chevy Trucks (newer or older) that have the bolt in the Cab corners will fit the 67- 72 Chevy Trucks?

All these questions are regarding to using correct factory parts in our 67-72 Chevy Trucks or at least to use General Motors Parts.