Here’s a post for the search engines!

Volkswagen part number 179 847 681 ‘handle’, is the latch for the sliding window on a US-built, 3 piece rear window slider for a Rabbit Pickup.

This one came with my pickup in the spare parts box.  the one off the truck was missing.  The plastic ‘living hinge’ for a lock mechanism is terrible; I’m happy to have a brand new one.