Not sure if I broke this today, but...

Bummer. That might be really hard to find. I have been into Mopars for 50 years, and I have never seen the "byChrysler" emblem. I have seen a zillion "Chrysler" emblems, but the "by" in front of your emblem tells me that is an Ausie piece only. There is a way around it that will not be all that noticeable. I would do this only if you cannon fint a replacement. Buy a small roll of the double-sided trim adhesive tape. I would go to a car parts store here. Then very carefully, grind/cut the mounting posts off the back of the trim pieces. Then temporarily try gluing them together with a few drops of super glue. If the glue works, fine, if not, you will need an extra pair of hands to hold the pieces together while you perform the next step. Place the trim piece face down on a table. You are now going to use the double-sided trim adhesive tape to permanently hold the two pieces of that trim piece together. Cut a piece about 13mm (1/2") long and apply it to the back of the trim piece bridging the gap where the break is LEAVING the peel off plastic strip that protects the top side of the tape in place. Trim the tape so that you cannot see it from the front when installed. Now, cover the rest of the back of the trim piece with the tape leaving the peel off plastic strip that protects the top side of the tape in place. Now with a new/sharp razor blade or Exacto Knife blade, trim the tape so that you cannot see the tape from the front. Now peel off the plastic strip that protects the top side of the tape and carefully place the emblem in place AFTER cleaning/prepping the area. It is time consuming, but if you are careful, it will work fine. After all, most emblems are put on with double-sided tape nowadays.

I know exactly what you're getting at, and I have some 3M Trim Adhesive Tape here. I bought a new (used) emblem on eBay, but I think I'm going to take a "hybrid" and/or temporary approach on the fix and carefully remove the remaining tape on the car, and the broken piece of the emblem, clean them both, and then temporarily reapply the broken piece.

The car is going back home next weekend, and once Bazza has had some time to take it all in (the car hasn't been on the road for almost 3 years), I'll add this to the list of things to go over, and I'll repair this in whatever way he feels is appropriate.