What do these numbers on my 65 Cornet 500 426SW signify ?

Front radiator support: MK - 41 1
and
Left side trunk lip under the weather stripping ?
Either EMA 45 or BMA 45 or CMA 45
It's hard to make out the first letter, its an E or B or C

Thanks,
RF

I think those are just stamping numbers for the part it self. The SO numbers are on the package tray and core support.

Thanks for the reply. Where would I look on the package tray ?
I lightly sanded the top of the core supt across the total length of it and found no numbers. I also have a 1967 GTX and the SO numbers are on the driver's side top of the core supt clearly legible. Are the 65 Coronet in a different location ?
RF

Look on the engine side of core support. The drivers side of package tray.

Tkanks again,
I found them...........

RF