Mk1 Sq 4 Solex Bi-Starter carburettor or carburettor top wanted

[T.J.FALLOON]

Hello all,

I have recently got my 1951 MK1 Ariel Square Four back on the road. I am presently running an Amal concentric carburettor on it. However I am having the infamous sticking slide issue with it. Other than that the bike is running perfectly.
I have an original Solex Bi-Starter carburettor but where the fuel inlet banjo bolts in is completely shot. The thread is stripped and there is a crack around the flange.
If anyone could assist me with either just the top of a carb or a complete carb I would be most grateful.
Attached is photo of carb top.
Thanks in advance.