Universal 12v heaters

I'm looking at removing my factory heater unit and put in a smaller compact one.

If anyone has done this to their ride, any info you could give me would be great.

Thanks

Anyone?

I have heard of people using Mojave Heaters. not sure if this this is it...
http://www.jcwhitney.com/webapp/wcs/stores/servlet/Product?storeId=10101&Pr=p_Product.CATENTRY_ID%3A2002903&TID=101&productId=2002903&catalogId=10101

check out vintage air maybe they have something that might fit the bill they do a/c so maybe they do heaters as well

Summit racing has a pretty good selection.