Bed bolts

[KVB]

Hi,

I have a 1965 GMC short wide. I am in the process of doing the box floor with new Southern Yellow pine. When I took the bed apart and removed the rails, I found that I had Ribbed neck carriage bolts, sometimes called Track bolts. I am having a hard time finding these, as they are not a very common bolt.

First, has anyone else come across this type of bolt in thier box, and Second, were you able to find replacement bolts. If yes, where?

I am considering buying new strips and bolts, but the originality aspect intrigues me.

Any info would be greatly appreciated.

Ken
Montreal