Smaller heater box options without a/c

[NJM73]

I am looking for options for a smaller heater box that I can move totally into the cab. Kinda of like the aftermarket ac boxes but without the ac. So far mojave heaters are the only thing I have seen that look like they might work. Are there any factory boxes from other models that would fit well? Wont have a source for vacuum so the box needs to be able to function off of the factory switches or electronic switches
Thanks

[B. W.]

Commercial auxiliary heaters for medium / heavy trucks are simple box heaters with a blower (Red Dot is one manufacturer)

Old Willys pickups had very simple box heaters also ( when heating the cab was an after thought)
A couple of examples:

https://www.amazon.com/Auxiliary-Hea.../dp/B00E5ND62C

https://shop.willysamerica.com/Box-Heater-p/94534b.htm

[HO455]

Good day neighbor! I have to admit I'm not sure what your goal is here. But that being said the aftermarket may be your best bet. Here is a link to one style. There are lots of versions for boats and marine applications. One thing to remember is if you don't supply outside air you will get fogging of the windows if you have it hooked to the defroster vents. I don't know why this is but it is.

https://www.englundmarine.com/produc...MA1090002.html