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You don't say what kind of truck. I'll guess that it's an M39 series. Manuals are here: TM's for the M39 Series 5-ton | SteelSoldiers
You can find the part number in the -P manual.
My switch is totally different, it's a toggle. I have an M813.
The truck is a M929 Dump Truck. The tuck is on govplanet. But I have never seen a blower switch like that, I have only seen the toggle switch type. I am currently working on building a customer heater for my m35a2 and would like to use that kind of switch for the blower. All on or nothing for the blower.