Yeah, well, Dumb ME.
I was at the dealership this past week, for an oil change, and got involved with them on an issue about the TPMS system, and totally forgot to ask about the winter front issue. Anyway, I'm going to order the part from Geno's today, and install it as soon as received.
I'm not driving that truck a lot right now. But when we do use it, it's normally open highway and 60-70 MPH speeds. And we are getting sub-zero temps.