Above, dry cartridge adapter and filter
The dry cartridge adapter was sold by USM.   I don't know if they still make this part or not but as I said it sure was great way up North.
Other mods that I did were to add a top. This was a pretty nifty replica.  It was made from OD vinyl and cut in a pattern pretty close to the orginals.  It was only $250 and came with doors!  Beachwood had a top made of canvas and I figure it would have cost me around $1000 including doors.  I should have bought two of the vinyls as no one is making them for that price any more!
Above, adapter and filter, ready to install
After North Dakota, I was sent to Fairbanks, Alaska.  Drove up the ALCAN (that was in a Suburban not the jeep!), draggin the jeep through Canada with me.
During our stay, I had the opportunity to drive the jeep at -45 F.(actual temp none of that wimpy windchill stuff) as my primary daily vehicle wouldn't start and I had one of those AF jobs where you had to get to work no matter what..  I kept the ol' gal in the garage and she started right up.  The jeep at that time had two heaters, one under the dash for my toes and one in between the seats.  Now if you have never lived in Alaska you might not understand the thrill of driving in ice fog so thick that you can't see anything in front of you.  I had to follow the white line painted in the middle of the road. 
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