I have a 1955 Chevy bel air hardtop with a 200r4 transmission. I purchased a champion aluminum radiator and cannot find the fittings to connect the cooling lines to the radiator. The threads for the end going into the radiator is 1/2 x 20 straight threads. The end going into the cooling line is 5/15 tube od with flair. I don’t want to change out the cooling lines so any help I can get will be greatly appreciated. I have checked all the parts stores, champion manufacturing and their distributors and got nowhere.

 

You may just have to find the right nut and then put it on the line yourself buy taking off the one that doesn't fit and re-flaring the line with the correct size nut on it