'09 regular cab - would JBL make a difference?

If he hasn't already shipped it, you really need to give him the heads up - he might be able to fix you up.

 

Good idea....but I think they're on the way. It's ok. At this point, I'd rather just wait and see everything with my own eyes. Ya TRY to prepare with the info ya have available but sometimes ya just can't. It's strange - more sites than I'd expect say 5 1/16. I know the drawing shows 5 1/8, but what if there's a lip or something that accounts for the other 1/16 inch.... or something.... too many unknowns and not enough definitive info. Who knows - maybe they'll be a perfect fit! Worst case - the hole is too small and has to be modified and that's not too bad.