Fast delivery by Amazon, I'm also not expect anything else! Thanks Amazon !!!! The adapter rings have I incorporated into a Golf 4 front right and left without any problems and have nuts and bolts used for fastening. Before I have the support surfaces provided with some insulation from the hardware store to avoid vibrations caused by the bass. The bearing surface of the speaker I've insulated with the same material. The speaker itself (165mm) fit purely and easily thanks to the slots in the adapter rings, cable management was also without any problems. Strong buy recommendation!