47-54 radiator from Brothers

The above radiator is an aluminum radiator that is on sale right now till the end of october. I have called to confirm if I can get it in the GMC version. I was sad to find that it is only available in the Chevy style. I would like to know if the radiator would fit in my GMC. I know the filler neck is different but is anything else. I could probably get a local radiator shop to modify it or posibly do it myself but it could be an expensive mistake. I am having a hard time finding an aluminum radiator to fit that is not expensive. Any thoughts would be very benificial.

My truck is 51 gmc 1-ton with a 454 and manual transmission.