Raw Stihl

I can't find the proper replacement for my interior heater blower motor with integrated resistor. Part number is 23487750. GM OEM parts online says it's discontinued. The replacement I bought from the auto shop and all the others I researched online aren't the right ones. My blower motor has 4 leads going to a four terminal plug. The only ones I can find have only two leads. So they don't work. Sure the plug fits but they are missing two leads. Attached is a photo of the part number off the back. What do I do now? Sincerely, Raw.