If someone has one laying around would need one.

Can a nipple just be screwed into a small pilot hole in normal seal ?

It could be possible with a ring in between and a counter nut on the inside , but its a very flimsy seal.

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The sound of a V-twin engine braking is music to my ears!!

Thought of that possibility also if i can´t buy or get one made. Or just pull the plastic plug, fill with LM grease and put a new plastic plug there. Do this once a year would probably be good enough with my mileage.

They are 32.03mm ish and 5mm ish thick

Thanks, good to know if i find someone with a lathe.

Did you get one made or bought from Spondon 440 in the meantime?

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The sound of a V-twin engine braking is music to my ears!!

Found someone (Andrew Franchi) on the Facebook site selling them.

AKA Spondon 440

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Buell Ulysses XB12X 06/08

Yes that's Spondon 440

He also sells the piece that replaces the plastic from the fuel cap.
It's worth it to get that one to!

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The sound of a V-twin engine braking is music to my ears!!