I bought this lever - https://www.ebay.com/itm/Right-Brake...72.m2749.l2649
It fits great on the ATC. Most of the aftermarket drum brake levers are for motorcycles and foul on the ATC throttle before touching the grip. This one is long and has a nice dog leg shape that easily clears the throttle. It does have a mirror mount and brake light switch. I can't speak for the durability yet, but it's a <$10 lever. If it cost $40 it wouldn't be any better though.
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