AVIC-Z1 and 4Runner with JBL system

[KidA]

I'm installing a Z1 into my 4Runner and would like it to look as stock as possible. I've seen non-JBL Z1's mounted and they look great. Mine however, has gaps on either side of the unit.

Does anyone know what I can do to achieve a stock look? I would prefer not to have to fabricate anything myself.

I live in the DC area if there are any good installers that could do this for me for a reasonable price.

Thanks