I removed the switch from the dash panel to see if there were any model numbers on the switch itself.
Carling Technologies
V8D1 with some other characters 1652 R
V8D1 is indeed the Contura V series of switches (thanks Chateau_Nomad) but finding one with the same style of actuator has so far yielded zero results.
I called Thor and spoke with them. They sent me a screenshot of their parts catalog but said they were out of stock and had been waiting three months for the supplier to deliver a shipment. This thing is IMPOSSIBLE to find online and I'll keep looking. Sharing the part information here in case others are looking.
Thor Part # 0472508, SWITCH, GEN START W/BAR (WHITE B/L) FOR DASH ASSEMBLY, CONTURA V