This was a good write up, however they missed a few steps and I have to work around it. This is a write up that I posted on my club's forum. This should work for any TJ or LJ Wrangler (mine being an LJ). Some may say, "Why not just buy TJ doors?" They usually go for twice the money and doors (regardless of model) don't always come around at a good price.
First off, you have to remove the TJ striker by unscrewing the bolts then bend out the little tab on the back side holding the nut mounts and take the nut bracket out.
Take the YJ nut bracket and slide it where the TJ one was. put about 3 or 4 washers on the YJ striker pin and screw it in through the top hole that was made from the TJ striker pin.
Second, unscrew the 3 bolts on the side of the door to release the catch/latch. Push it down and out of the way so you can cut/grind off this metal tab that is in the way. Then bring up the catch and line it up to where it will need to meet the striker. Then drill 2 or 3 holes below and slightly inward (toward the inside of the jeep) so that it can be remounted lower and line up with the striker pin.
If you want to open the door from the inside you will have to cut about an inch off of the end of the inside leaver so that it clears your TJ's dash. I didn't get a picture of this so I'm using the picture from the first poster.
Now I have half doors on my LJ!
They need paint, so I plan to paint them matching silver and paint the handles, mirrors, and hinges black.
I would say the main downside to this is that I have to swap out the striker pins when I switch between my full and half doors. However, this morning it took me less than 5 minutes to do this. I plan on just keeping the half doors on in the summer and put the full doors on in the winter so it's not a big deal.
Also, a quick note:I haven't gotten this far yet, but from what I have read, in order to get uppers to fit you will need TJ uppers and modify the front mounting pin. Some have said that you will either need to bend or cut and re-weld the front (closest to the hood) pin back so it lines up with the YJ door holes. I will post some more details and pics when I get to that point.