Where can i get a block heater for a 1998 ford e350?

any ford dealer will sell you the heater you require. NOTE: in the fords this is called a block heater.it is in fact an engine oil heater that screws into the side of the engine oil cooler on the side of the engine. most 7.3 engines have these. look between radiator and grill for a rolled up ectrical plug in.when new thses cords are rolled up where most cannot find em

if you dont already have one intalled, the heater costs about 75 bucks,and the wire harness for it costs about 175 dollars