Rebarbing Question

Hi, I am rebarbing my 3/8 radiator to 1/2. I was thinking of getting the chrome barbs at Danger Den. They say it is 1/2 OD. Is this the correct one I need to purchase for my radiator if i want to use 1/2ID tubing? PLEASE REPLY ASAP b/c i want to order today. THX!

Yes, 1/2" barbs are for 1/2" ID tubing.
You can also use the 5/8 barbs, but it's more sweat to push on the smaller tubing.