That foot stomp switch that Tim has a link to, is a very common switch. A lot of the old farm tractors have the same switch. They just operated with a hand pull rod with a lever to "stomp" the switch. Any parts store should have them.
57 GMC LCF 370 55 John Deere 40-W 59 John Deere 430-W 2000 GMC 4x4 56 John Deere 420-W Pix on Photobucket