new radiator sizes

[mikesacs]

I have a 62 1/2 ton that needs a new radiator. It has a 400 small block automatic. Looking through the parts catalogs I have two choices for the heavy duty (3 core??) with tranny cooler. Either 21 3/4" wide or 23 1/2" wide. My current radiator is the stock 21 3/4" wide and does not have the cooling capacity. My question is - will the 23 1/2" wider radiator also bolt in? I'd rather get the wider one if either radiator will bolt in.