I have them installed - good fit, but the sound of the speakers coming with the panels is definitely a little too "retro" (rather tinny and without bass) for my taste. I have replaced them with other speakers (brand is "Gladen") - you surely can take any other brand, just take care they have the right diameter and depth (as I remember, the necessary depth - which I can't remember because it's quite a while ago since installation - was not easy to find). Even when switching to higher quality speakers, when you are into deep bass tones, you absolutely will have to install a subwoofer. There are some really small ones on the market that can be installed underneath the bench/seat.
And I can't recommend to install the panels "out of the box". To prevent the plastic from vibrating, I adhered a rather heavy "sound deadener mat" on the backside of the panels.
I would buy them again - but just the panels without speakers
