Bed bolt specs for '79 SWB?

[brossow]

Anyone have the specs for the bolts that hold the bed to the frame for a '79 shortbed fleetside? (My '79 came with the bed unbolted or else I'd just measure what I already had.) I can't help but think I could find what I need at the local hardware store rather than paying the inflated prices + shipping to buy a bolt kit from one of the usual vendors or eBay. Don't need anything fancy, just something to hold it on while I move it around and work on it, and figured it would be easier to ask here than go the trial-and-error route.

Thanks,
Brent