A-Wing and B-Wing part Identification (Reward Offered!)

[ChrisThePropGuy]

Hello,
Over the past year or so Ive been on a mission to collect all the original found kit parts that go on the A,B,X and Y-Wing helmets.
Ive pretty much got them all and am looking to do a write up of all the ID's however I am stuck on the last 2.

Part one is from the Rebel wrist communicator, it is seen on the ears of A and B-Wings.
The part I am looking for is circled in red.
It looks to be injection moulded in grey. I checked my PT15 and flak kit and could not find it (unless Im stoopid)

 

[ChrisThePropGuy]

Second part is a little more difficult!

Its a dome part with an indent.
The square part with the ribbing is seperate (from midnight special) and the circular detail in the indent is a nylon dome head bolt.
I suspected this could be a modified Saturn V Stage 2 hydrogen dome originally but it is missing the index indent on the flared edge as well as the edge not being completely circular as seen in 3rd pic. Diameter is about 40mm wide.

Any leads to these parts I will be offering a free wing kit of your choice, just pay shipping.

 

[Mottrex]

Those look cross between Model kit panza tank turret hatches and the vacuform inserts from old headphones?