I'm from up north too. I am used to ripping them out to gain horse power

I just stick to my alternator, water pump, and power steering pump.
I imagine they make kits, but I've been unable to find one. My friend had A/C installed on a 1979 Ford Fairmont station wagon with an inline 6 200. I think it cost about 600-800 bucks for a shop to install. If you want to do it yourself, you'll probably need to know what parts you need. You'll need to find a Ranger book with all the part numbers. You can prolly get free photocopies from your Ford dealership.
Another option is to call a junk yard. Tell them to pull everything you need to install A/C on your 1995 Ranger 2.3L. Usually, they know what they're doing, usually... You'll prolly have to take it in to get inspected and filled after the installation. New hoses might be a good idea too.
160,000 is not too bad on a 2.3L. As far as I know (I'm a 2.9L V6 guy), these engines are runners. I also have a friend that has a 1996 Ranger with a 2.3L (no A/C) and he rarely has problems. I think the last thing that went wrong was the alternator. 110,000 miles
Pete