The 114 degree part may or may not be right, I did see some bolts called 100 degree, I think that's the angle of the countersink. I may be able to use elevator bolts, but I'll keep looking for plow bolts. I also checked on the Grainger website, didn't see any that small. I did find something that might work if I wanted 1,200 of them:
https://www.globalindustrial.com/p/...9-avW8QIVQRB9Ch1jegjiEAQYASABEgIvbfD_BwEI'd like to see if it fits before buying especially that quantity. Now I feel like I should take the endcap with me when I go searching. I didn't know there were bolts there they sit flush and just blend in nicely. Today I will go by the local Fastenal and see if they have something:
https://www.fastenal.com/products/details/0110615This is 5/8" long and not a catalog item, may have to have some made? The problem with on-line catalogs is they don't contain some odd bits that you might find in a dusty bin at a retail location.