A front left door opener handle just sold on eBay for $190! The rear handles seem to be a little easier to find, and certainly less expensive!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 edge of the fork. In trying to fit rear to front, I decided not to trim the rear unit, so as to keep the fork as strong as possible. Sooooo -
Take off the armrest,take out the foam packing and undo the two screws to remove the broken handle. As you do, note carefully how the return spring fits, and how the lever itself comes out of the armrest.
Very carefully, trim the inside of the armrest so that the rear handle will just go through it. Take your time, and don't overdo it. I used a Dremel tool, with a metal burr.
Caution! Don't trim away the spot where the lever "rest" button touches. I found out about this the hard way, so you don't need to.
Then the new lever can be put into the armrest in exactly the same way as the original one was.
This will make the fork of the new lever set about 1/8 inch lower than the original. Take the Dremel, and 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 lock rod in the fork, and be sure the fork doesn't scrape on the edge of the hole when you move the lever.
When you're sure you have clearance, replace the armrest sealing foam,hook up the lock rod, and re-install the armrest.
I haven't checked the right hand levers to see if perhaps they are the same.
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Dennis Martin