JC Whitney:
http://www.jcwhitney.com/Washer-Swit...8041366&VT=sch

QualityKits:
http://store.qkits.com/moreinfo.cfm/MX041

eBay:
http://motors.shop.ebay.com/_Other-V...__180159451294

Varying level of difficulty in installation.

-- John