I am working with a muffler vendor to recreate the correct transverse muffler / resonator for 1967 S code Dual Exhaust. Does anyone have their original muffler that shows the part number stamping or at least know what the correct part number is for the '67 Cougar transverse muffler with dual exhaust? It should be something like C7WA-5230-A? I have done what I think was “exhausting” search of the forum. 
Thanks!