Maybe I'm missing something obvious, but what is a "123 Bluetooth distributor from Germany"?
Another curiosity question; are these distributors taller (longer) than normal? Is that why extra clearance is needed? I'm not looking to buy one, just wondering.
As to these working or not, I'd imagine the real question might be if they continue to work reliably for any length of time. Don't get me wrong, I'm not suggesting they won't. I'm just saying that would be the test of their quality. However the question of quality is not specific to these; you will pretty much have the same question regardless of what part you buy, regardless who you buy it from, and regardless how much you spend for it. As the automotive parts market has become a global commerce the issue of quality has been blurred beyond any normal expectations for all brands and price points. So it's a total gamble anymore, you don't always get what you pay for. That might make these distributors a great bargain. Especially for a hobby car that isn't driven much.