Seatbelt conversion for a 71 Blazer?

[roberteberts]

Hello all, i have a 1971 Blazer and at the moment i don't have any seatbelts at all in it but i want to put in seatbelts with the shoulder harness or what i'm guessing they call a three point seatbelt. can anyone tell me how i might go about modifying my blazer to make those kinds of seatbelts fit? i read the post about the 3 point belts that someone put up but still a little unclear on the process. where would i drill the hole on the blazer for the shoulder harness part to mount? does anyone have any pics of an example they might be able to email me?