The only problem you will have is trying to use the 50 grill on the 54 fenders. They will not work. I would suggest selling the 54 fenders and buying the 48-53 fenders. The 54 are rarer and it is a semi-mortal sin to cut them up. There in Kansas there should be old AD series chevy trucks on every corner. Start calling around and you should be able to find some.