If I recall, they are 3/8-24 washer head bolts about 2" long. Thats what's on my '74 and I think yours should be the same. If you need, I can pull one tomorrow and verify if someone else doesn't have a different answer.DC78FSJ wrote:I can't seem to locate the bolts that attach the seat brackets to the floor. Does anyone know the size and thread of those bolts? Thanks