[veltro]

The detail you apparently refer to, that is the second smaller "beule" on the right cowl side, has never had anything to do with the "trop" version and was never associated with it.

AFAIK, it was a later design originally foreseen for the G-5 (to accomodate a compressor) but so many cowls of such version were produced (in comparison to the small number of G-5s done), that this cowl was adopted also in the late G-6 and normal G-14 production, without anything inside requesting the presence of the smaller "beule".