Huey Boom Parts

I have these two sections from a Dornier UH-1D ex Luftwaffe. I think they are both ex boom as the chap was selling boom sections.

The other two parts I got at the same time are boom sections.

I think that the one on the right is one on the two lower hatches on the tail boom. Can anyone confirm and secondly – were they just access or for some other purpose.

The piece on the left looks like an antenna mount – just cannot see the antenna on the tail boom looking this large.

The Antenna mount on the NAV versions upper fuselage looks similar- but are port not starboard ?

Thanks for the help!