Help with body mounting bolts

[mkmc69]

I am looking at a 1972 short bed fleetside that the p/o said has been in storage for more than 15 years. Apparently the body has been taken off of the frame at some point to start a restoration and somehow the body mounting bolts can't be found for whatever reason. I need to know what size of bolts to purchase so that the body can be put back on the frame in order to transport it. I need cab bolts, bed bolts, and core support. Any help is much appreciated, thanks.