I bought a new radiator for my f100. Have swapped out the original 300 to a 460 so when I replaced the radiator I put one in speced for the 460 which had different fittings.

New radiator had plugs threaded in there so I was able to just take one of those to the hardware store and get the right ones. They are just NPT to flare fittings that you can find at any hardware store. And as I found out....different radiators will have different sizes.

Both were I believe 3/8 flare but the NPT going into the radiator was different. 3/8 on one and the other was 1/2 I think. But again common fittings you can get at most any hardware store...got mine at ACE