Are the smallblock and bigblock supports the same, other than the width on the lower left corner? Thanks for any help !

I didn't know there was a difference. I bought one from NPD 5 years and they only list one, it worked in my big block 70.

I am finding out that there is a difference in origanol ones.The lower left corner is wider on the bottom tray.I'm just not sure if thats the only difference. Forgot to mention it is a 1970!

Mine is also a 70, learn something new every day.

The opening in front of the radiator comes in two sizes. However the smaller ones are stamped so you can see where the larger opening should be so they can easily be cut out.

I think the 307 cars and possibly 6 cylinders got the small opening...

I am finding out that there is a difference in origanol ones.The lower left corner is wider on the bottom tray.I'm just not sure if thats the only difference. Forgot to mention it is a 1970!

This would be only on cars with the large 4-row radiator... The piece to expand that area is being reproduced by Hinshaw's.