What is Reddit's opinion of beler 2 to 1 Radio Antenna Adapter Double Fakra RNS RCD 510 310 315 210 to RCD330 fit for VW?

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Well you should be all good then.

I'm guessing you live in US? Looking on eBay someone is selling one in New Jersey (with just Apple CarPlay) with bidding starting at $99/or you can buy right away from $279 (which is at $100 unless than normal). Thats a good deal considering lower price and not being Chinese stock. Link

Couple of potential issues:

1. You will need a double fakra to single fakra cable adapter when installing. According to the description of that unit it should come with it but if it doesn't you will need to order one online. If you order unit from China it will definitely come with one though. The other cable that might be included is a reverse camera adapter, you won't need to use that due to not having camera.
2. The unit might also be programmed to expect a reverse camera, meaning everytime you go into reverse the unit throws a camera not available error. This can be fixed by having a VW workshop/expert program the unit to not expect a camera. Hopefully previous owner already had that done though. If you order a unit from China just ask them to disable reverse camera for you because they can do that usually.