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I let a 1985 magna set for too long, and need to rebuild carbs, unfortunately the vacumn piston is out of production and unavailable. its actually the rubber boot is shot. has anyone ever found an alternative part to the oem part, or another part/year that would work?

You might want to check a forum dedicated to your bike for an answer.

I have a 3rd Gen Magna. This is a good site for V4s, including your earlier Magna: http://v4musclebike.com/