I've put (2) 5.25" JL C2-525 speakers in the front doors of my '95 Corolla, however the stock speakers were 4" speakers. In order to compensate the increased mounting depth, I put 2" spacer blocks between the speakers and mounting brackets. My problem is that there's about 1.5" of exposed speaker in the cabin of the car now. I currently have duct tape covering the opening to protect the speakers, but this is nowhere near an ideal solution. Here's a picture of the speaker on the driver side:
Any suggestions for a better solution?