The obvious answer would be to ask the sellers, but typically the original flasher unit (usually near the fuse panel, but I can't say for sure for Audis) is a bimetal-strip heater type flasher unit. It gets hot because of the load of the regular incandescent bulbs, and the heat makes it shut off, then it cools and reconnects, etc, and hence flashes. But LED's take much less current so the stock flashers don't heat up enough to work. Some people add resistors to create a fake load, but that's purposely burning power and totally defeats one of the major benefits of LED's. The better option is electronic flashers, which I assume these are. It should be a matter of pulling out your flashers, and replacing them with these, or wiring these into the flasher circuit.
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