Inside door handle fix, '91 164B.
A 164 left front door-opening lever recently sold on eBay for $190+ !! They are hard to find.
I have fitted a left rear handle in the left front position. It is working well.
Take both a front and a rear handle and put them together, and you'll see the difference - it isn't much!
You'll find the rear "fork" is wider than the front one, and the extra width is on the bottom of the fork. Otherwise, the levers are the same. In trying to fit rear to front, I decided not to trim the rear unit, so as to keep the fork part as strong as possible. Sooooo -
Take out the foam filler from the armrest, and the broken handle. Notice carefully how the return spring fits, and how the handle comes out of the armrest.
Very carefully, trim the inside of the armrest so that the rear handle will just go through into position. Take your time, and don't overdo it. I used a Dremel tool, with a fine metal burr.
Caution! Don't trim away the spot where the rubber "rest" button touches. DAMHIKT!
Then the rear lever can be put into the armrest in exactly the same way as the original one came out. Install the spring and tighten the screws.
This will make the fork of the lever set about 1/8 inch lower than the original. With the Dremel, trim the hole where the fork goes into the door about 1/8 inch lower. Check with the armrest in tight(but not screwed down) and the pull rod hooked-up to be sure the fork doesn't scrape on the lower edge of the hole when you pull on the lever.
When you have clearance, replace the armrest sealing foam,hook up the pull rod, and re-install the armrest.
I haven't checked the right hand levers to see if perhaps they are the same, but I suspect they are.
'94 164 LS, Black
'91 164B, White