Re: Gas tank / Petcock questions
The petcock you show will fit the tank you show. This is the newer style tank with the petcock having a reserve position in the kits. The one you posted will fit the newer tanks but does not have the reserve position on the shut-off.
All my recent kit tanks look like that. Better parts in my opinion. Never had any leaks with the new one, unlike the older style.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.