Could someone please tell me the dimensions, especially the length (longways) of a '67-'69 Camaro muffler?

I am actually looking for a '74 Camaro muffler but I've been completely unsuccessful. I see the '67-9 which looks the same, but I cant tell if its remarkably different, size-wise.

Any help?

 

Wow, helpful group. thanks very much everyone.

 

it's kinda hard to answer if we don't have a stock muffler laying around to measure from.

Are you looking for the combined muffler or the duals?