they better be really big resistors, it's wattage that's important ... variable speed heater blower switches should be available from a NAPA - look like this

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics