The part number for the updated metal version from TOYOTA is 69090-0C080.
LIST price is $73.08 Toyotapartszone website has it for $57.36
They list it under "Body"...."Back Door Lock & Hinge"...."handle assembly, back door, outside.
When I ordered a new "license plate Lamp assembly" under "Electrical".......I got the whole thing......color panel, lamps AND new metal latch.
I had ordered the latch separately thinking that it was not a part of the lamp assembly.
If you order the lamp assembly, use your Vehicle Identification Number (VIN) so that it will list the correct color for your vehicle.
Each color has its own part number.
Of course, my silver one, for some reason cost more.....but that is just how it goes.
When installing the new unit.....I slopped on some Disk Brake Caliper Lube......it is thick enough that it should stay in place....and prevent the normal rust that seems to develop.
I would like to add that this website that I listed has very detailed drawings that have helped me out several times in determining what part to order.