door catch

The “pin locking retainer” (8Z0 837 257) on one of the doors appears to have cracked, causing the door to only shut with a firm tug. Where can I get this part? Is it the same as this one here for a Bentley Continental GT ?? https://www.scuderiacarparts.com/part/114172/bentley/8z0837257/pin.html

Finaly got round to doing the micro switch and door stop on the drivers door, well full catch has to be replaced, no wonder the tech at audi didn't want to do this, its not for the faint hearted, good job i've done jobs like this at work, but not on an A2. Its a full door strip glass and frame...