s130 said:

That membrane is the accelerator pump diaphram.

This is a very useful link

http://www.rmcarburetors.net/addhe_rebuilding v2.htm

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s130 said:

If you can't locate a new diaphram then I may have an old used one buried away in my garage.

I keep all these old spares so I have rescue route for myself, but in this case I actually have new complete kit for our Strada Abarth so am more inclined to part with an old part.

I would suggest you try and find some new parts though.

The original Fiat Solex refurbish gasket kit was Part No: 9938840

I checked with my Fiat dealer and this part number is no longer available/supplied by Fiat.

You may be able to locate on the internet though.

Go find

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Thanks Nick! very much appreciated.
Actually found a company here in Sweden.
Alfa uses Solex alot