Did you TRY a dealer ? Sometimes they can order a part that individuals can't get - I'm sure there will be a mark up on the part, but you might not need to get a whole unit.
I've had good luck with the JB Weld by layering - rough up the surface, put on a layer and put a piece in the first layer spanning the break, let it dry (harden), rough it up, apply another layer --- etc. the extra pieces act like splints.