The installation of 968 mirrors onto 944 doors is really quite simple. 
The first step is to find a set of mirrors. 
Second remove the old mirrors. If you rotate the flag style mirrors about the pivoting base you will find a single bolt. Remove this with the proper hex wrench 
Mirror removed from door. I chose to cut the original connectors off both the car door and the new mirrors and install new connectors. (you may be able to find the original connectors and just re-wire one side) 
I purchased this simple 6 pin connector from radio shack, you will need a male and female connector for each side of the car. The pin extractor pictured on the right is a necessity if you are prone to not getting things right the first time and having to move wires around to different holes in the connector. The instructions on using these connectors are printed on the box. Each wire should be soldered into place to ensure a good connection. I recommend completing all the wiring ahead of time so if theres any doubt about which wire goes where you can plug them in and make sure its doing what its supposed to. If for some reason you would like to remove the glass (perhaps to get better acquainted with the wiring of your motor) 
Note- the small bulb sticking out the bottom of the mirror in between the two arrows was some sort of light, I am not sure what it is used for, I suspect it is to tell the driver that the heated mirrors are on? This has two purple wires leading to it which I chose not to connect. you will need to unlock the mirror face by inserting a flat head screwdriver into the bottom of the mirror through the hole in the rubber (flag style) or the metal case in the 968 mirror (right arrow). There you will see teeth of the plastic locking system (left arrow) if you rotate this fixture it will release the glass face and you will be able to pry it off with little difficulty. 
The two wires connected to the glass are for your heated mirrors. The other four consist of two wires each, for the up and down motion of the mirror and the side to side motion. The wiring was as follows for my car (1986 944 Turbo) 944 Door 968 Mirror White ------------------------------ White Black |--à White/Brown ------------------------------ Blue Ground--| Brown/Black ------------------------------ Red | --à Black ------------------------------ Black When removing the old connectors note the wiring, the ground is used twice in two different sockets, there is a small 2 inch black wire running off the ground into another socket so both side/side and up/down motion can share the same ground. The two other wires are for the heated mirrors and were all brown on both ends on my car. If for some reason your wiring is different you can easily determine which wire from the door controls what by using an ohm meter. Switch the ignition on to the accessories switch and apply power in one direction using the selector that you would normally adjust the mirror with. You will find voltage running through the two wires corresponding to the direction you chose. The polarity is reversed to make the glass move in the opposite direction. 
With both ends wired correctly you need to just plug the connectors together and reattach  
 The finished product looks great!
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