I recently aquired a 1973 vette ttops which is equipped with shoulder belts, my problem is that the belt will not stay in the hole in the seat when I pull the seat forward to access the back, even getting the belt through the hole is a chore, is there something that goes on the belt to keep it from moving back into the hole in the seat. Any help would be appreciated

Yes, there is a plastic sleeve that prevents the seatbelt from coming out. The sleeve is kinda "t" shaped and about four inches long. E-bay? maybe Corvette Central. Hope this helps.