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Way cool!
Try this link as they may still have parts for both the original McDonough brand Tin Lizzies also Sharp Mini T's.
https://bikekc.com/about/sharp-mini-cars-pg179.htm
Online info indicates the McDonough T's had Mfg. tags on the rear left frame cross member behind the engine....if nothing there, look for lost tag rivet holes.
~ Pete
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