Can you tell me which fitting I need?
Rarely. Most fittings have to be matched to the existing by comparing dimensions.
Do you have brass fittings?
Yes, they are all available here.
Can you narrow down which fitting I might need?
We have fittings listed on the carburetor model pages, don’t assume there is one fitting for a particular carburetor, make sure you compare dimensions. You can access the carb model page here.