Possible ID of an ANR's Gustav...
 

I know it's a shot in the dark, but any help is welcome...

Attached are the images of two of the pieces recently extracted from the site of the crash of a Bf 109G in Italy. To be precise, this is one of the five Messerschmitts of ANR's 2° Gruppo Caccia shot down in their last combat on April 19, 1945.

Two of them were K-4s, but in the site researched were found 20mm cases, so it should not be one of them. The other three were Gustavs but it is so far impossible to determine the exact version.

One photo shows a cockpit or parachute harness and the other is a plate apparently belonging to an electrical part. I know it is highly improbable, but could the latter restrict the field of possibilities?

Thanks in advance