I came across this odd 2004 that was converted to a Duramax.
Apparently, the seats are interchangeable throughout all models.

 

The real question is, did you drive the duramax H2?

 

I've never seen the vehicle.
I found it on ebay: Hummer H2 4DR WGN | eBay
I don't know how did the build, but it only puts out 500hp & 700 lb-ft, which is pretty bad. Also, $60k is laughable for an 04 with that kind of duramax build.

 

"THIS VEHICLE IS NOT LEGAL IN THE STATE OF CALIFORNIA FOR SMOG OUT-OF-STATE SALE ONLY" Probably not legal in most states these days. For me this is the #1 reason I can't do the duramax conversion. Not to mention the $40k that will never be remotely recouped. This car might be worth $30k with that kind of head ache.