I put a set of 4" speakers in the front doors using the OEM speakers as a frame. If you dremel out the basket, the hole is a perfect fit for a 4" speaker. This has a couple advantages; 1) you can use the OEM gasket & seal and 2) mounting depth for 4" speakers won't cause intereference with the window that occurs with larger 5-1/4 or 6-1/2 drivers, 3) keeps the OEM grills.
Sounds sooooo much better!
Sounds sooooo much better!