radiator support sizes

[Kenova]

All of the rad supports have the same size rad openings with the exception of the big block cars and some air conditioned cars. If you look closely at the lower rad saddles you will see a third one. This was used for the big block and a/c rad. There is also an imbossed area above the third saddle mount which was punched out for these cars. To use the bigger rad you could use the Nova big block upper rad brace and rubber seal or a brace from a'73 or '74 a/c model. Don't forget about the Pontiac Buick and Olds models when you're scrounging for parts.
Ken