Hotrod type heater

I saw a while ago on "Trucks", he showed a heater box kit that you can put in for vehicles that cant use the stock heater box, Looked like a pretty simple kit, just running the Heater hose to it, and mounting it. I was wondering if anyone knows what the company is that makes them or knows where I can find something like it.

theres electric ones to that are just cheap ceramic heaters

summit racing has a few