I think this is the correct brake arm: http://www.ebay.com/itm/Genuine-Baja...item27db9c114b
The Dirt Runner 50 and 90 were virtually the same bike, except for frame size.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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