About the same time I got the dash speaker brackets, I also got the kick panel pods from Captkaos/73-87chevytruck.com/RodDoors. They fit pretty decent but needed some reinforcement IMO since they're just thin ABS plastic.
After plotting out where everything needed to be, I got all the mounting holes drilled. They supply double sided tape but I felt that wasn't good enough to hold a decent speaker up nor did it allow servicing. I used the existing holes in the kick panel for reference & drilled the mounting holes then cut the opening where the speaker trim fit the best (don't tell Porterbuilt but I just eye-balled this
).
Once the holes were all cut & cleaned up, I lined the kick panel & inner surface of the pods w/BoomMat. The matt more than doubled the weight & made them feel much more solid.
Then once all that was done, I rattle canned them, put them together, & plumbed the wiring for installation.....