rear seats and all 4 seat belts

I'm new at this so bear with me. but i need rear seats and seat belts for all four seats. I have a 5 point harness that the guy i bought it from gave me but am not sure if it will fit a stock front seat. The orginal belt was cut on the drivers side. Also the back seats were stripped out to turn it into a dragster but i want them back in. its a 1987 Camaro with a 350 Tpi motor that i was told came out of a Corvette. i plan on getting new front seats that i know a 5 point harness will fit in. i need help!! thanks