Was it a dealer add on, or probably pulled from some other vehicle? �I was just wondering, Doesn't really matter anyway I've got no top, not like it'll keep me warm unless I did what I did when I was an Infantry LT in AK.
While stationed at Fort Wainwright, AK, we had open HMMWVs and as a "no good" officer I ran a long hose from the HMMWV heater right underneath my jacket and whenever I had soldiers in the back complaining of the cold I'd yell at them to shut the heck up, to tough it out and act like real Soldiers and stop being wusses,,,,,all the while when I was sucking up all the heat right into my jacket....haha!

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Honestly though, I was a good LT, I promise! �;D