Help needed: Chains

[Scrat]

Hi,

I am refurbishing my 0-6-0 diesel-outline petrol shunter.
One of the chains (roller chains, single) is of the wrong type.
It has a pitch of 6mm and just won´t fit. (the first 3 links do, but the pitch doesn´t match the sprocket)
The other chain has a pitch of 5.3 to 5.5mm and fits perfectly.
Now I am looking for the correct type of chain.
Is there any standard size between 04b and 03b?

Best regards

Holger

[Scrat]

Found the dimensions:

7/32" 0.2188" 5.5563mm

Can you recommend any supplier? This size is not available in Germany.