What size bolts hold the floor pan in a '37?

I was going to order today (from work) and didn't get the size assuming that Chevs40 had a kit. They do not.

What size bolts and where do you buy them?


~Justin

1937 Chevy 1/2-ton
"Wylburr Clyde"
In the Stovebolt Gallery
More pictures on Google

My Grandfather bought it new and Dad drove it through highschool. The 3rd & 4th generations put it back on the road on 8/8/2015!