Ha! I hadn't considered that it didn't come with the truck. By the way, I finally got it in. After seeing and considering the star washers on Reg's I decided to have another go at it. After I got it all hooked up, it did look a little large. I'm guessing that if, in fact, the heater is not the original/stock one, the truck probably was not sold with a heater because none of the other plugs are punched out. So, probably, the truck had a clean firewall when sold. The fact is, though, the Model 70 does fit, albeit a little tight. That would also explain why my glove box looked like it had been modified, i.e., cut down. I had to do the same thing with the box I ordered from Roberts as it was too long.