I'm thinking that without the fan clutch, the same bolts as 86-87 will work. the thickness of the pulley stamping for both v-belt and serpentine belt should be the same.
5/16-24 x 1/2" long. not easy to find 5/16 fine thread. I used ARP 751-0560 which are 5/16-24 x 0.56" long - 5 pk bought from Summit.
doesn't come up if you look by year, make, model - have to look up by size if don't have part #.