seat belt bolts

Can anyone with a 1968 Dart 2dr hardtop tell me which seat belt bolt goes where. The bolts have a letter and a number on them. I have four c12, four c11,and one c10. I need another c10 for a total of 10 bolts. What I am asking for is the position of these bolts as they are different sizes and I don't want to put the wrong ones in the wrong position.