I recently removed the the treble pickup cover from my'08 4003 Rickenbacker. In order to fill the large gap around the PUP I purchased a Treble Bezel made by Tubeampology. In Addition, I ordered the custom version of the standard model for no extra charge. This allows me to use a Ricenbacker Hi Gain neck PUP cover(chrome ring) to fill in the small space left between the bezel and the treble PUP. This gives a very finished looked. Frank, the designer/manufacturer was very helpful in providing info and the delivery was prompt.