Quote Originally Posted by SpyderRx View Post
Tried to install the JBL GTO528 today. They will not fit due to depth. The circumference looks to be fine. Even with a spacer or shim they will or fit because your top plastic would then not properly fit. I don't think the depth of the speaker is an issue as they are listed to have the same depth as the 428 I have installed. The problem is the circumference of the magnet is a good bit bigger than the 428 which hits the back of the headlight assembly. Oh well, it was worth a try. Now I have to try and sell the GTO528 as I broke 2 of the mounting tabs off trying to get them in.
From what I'm told there's only like 1" depth to work with. That's why I heard the Polk db401 work. Haven't done it yet myself