might try the dealership, but other than that is check the yards, you can use the same body style up to 88' i believe... Swapping cabs isn't that hard either if you find a nice one...
Well the cab I have was free, and the cab I have is the swap on cab. I'm putting on my K-5 Chasis and was just wondering if anyone knew of a source. Reckon it would be alright just to put a piece of sheetmetal underneath the floor pans and not worry about it?