choke stove for '72 250 C.I. six

[GrampaJack]

The coil (bi-metalic spring) for the auto choke on this engine fits into a cavity in the exhaust manifold; it is attached to the choke butterfly with a linkage rod. The spring on mine is weak. When engine is only partially warm, the vacuum pull-off overpowers it and the engine stumbles badly at part throttle.
I have tried ordering a replacement choke stove at different online parts stores (like LMC & NAPA), invariably they send the choke stove for a V8, even though I specify the one listed for the six.
Does anyone know of a supplier that will sell me the correct one?

Thank you.
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