Need help sorting out my heater

[tenni126]

Hey all,
Just got finished re-doing the cables and rebuilding the levers and all on my truck. Here's the thing: It looks like, originally, the deluxe heater fan was controlled by the middle lever, which has a slot for the arm on the switches I see for sale on LMC, ECE, etc. Mine, though, seems to have a different setup. Anyone seen this? The switch seems to be period, but that doesn't mean much. If not, could someone give me the rundown on the stock fan setup? Seems like, from what I've read, the switch should go thru the resistor pack, and give me three speed settings. Correct or no? Thanks for the help, as always!