Those are very cool. Kind of like the clear dizzy caps. SBC? Me LIKE!!! Sorry, no real estimate but, FWIW, I'd pay $150.00 if I had a cool SBC car to put 'em on. I love the Mr Gasket reasons for getting these see-thru VCs............they forgot "because they look COOL"!
Hey Rick - I'm thinking if you heated them up you might get them to fit on that '69 Chebby you are restoring!! :>))
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Sam... 
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