WTB:Horn part Bellville spring to fit '78

[asphaltburner]

Yo! Y'all!
Only thing that FRANKENTRUCK lacks is a Belleville spring for the horn. I have a couple of older ones, but at 2 5/8" they are too large for the two spoke, '78 steering wheel. I need one that's nearer 2 3/8" (hard to measure the wheel, but that's close,...can't be a ton of different sizes of Belleville springs for late 70's Chevy horns! Here's a '73 Bellevile spring next to it's other parts:



It won't fit this wheel:



which was missing ALL it's horn parts.
Anybody have any leads? Search has not been helpful at all,...but "Belleville spring" is not something that provides many leads!
Thanks, Todd.