67-69 Cuda 4 1/2" rim frt tire size ?

what size tires are you guys running with a 15'' x 4-1/2'' front rim on the 67-69 Cudas ?
I'm converting to a 73+ K member with disk , Car is mini tubbed and I'm now in need of tires for my new rims :)
I think the newer K member is a tad wider then the 68