haha, maybe at your meeting, ask the installed how much they charged the dealer to fit your sensors.....
If the figure is less than £350, turn to the dealer and make him aware that you know he got £350 from BMW...ask him where the rest went!
I think some of the compensation packages have been given by the dealer with the help of BMW, so agree, you cant have the £350 as well, but the point here is that they should've used that to help them pay for the sensors, not to make a profit.
It wouldn't of hurt them to say we'll do the sensors and BMW are contributing £350 towards it, but at the end of the day, that doesn't matter (apart from them making ap profit...that is wrong).
Just stick to your guns, say you had agreed OEM and these are not OEM (in appearance or operation or LOCATION) and that you are not happy.
If you could push for OEM looking from this company, what about the location? If you wanted to be picky, you could force that as well.
You said the installer didn't recommend his OEM lookalikes cos of having to stick a bar to the rear of the bumper....does he think that might fall off? If so, then his option isn't feasable, and new bumper etc is your only way.
When is the meeting...or has it been and gone?