Want To Swap: Seacam super dome and macro port

I have the following Seacam items:

Seacam

Superdome

macro port for 100mm macro

40mm extension ring

20mm extension ring

and would like come up with the following items in their place

Aquatica

Megadome

Flat port to suit 100mm macro

39.5 mm extension ring

21.5mm extension ring

or maybe a

21.5mm extension ring

and the new extension ring with focus knob for the 16-35mm

if anyone is about to buy Seacam and has a creative solution to my situation, happy to hear it!

cheers

darren

I have an aquatica part 18463 extension ring for sale. Excellent condition. I would like $140usd.Shipping extra The extension is $209 new.

Part 18463

EXTENSION RING

21.5 mm / .82” (overall 34 mm / 1.32”)