Okay, finally was able to get back to the install on the corner speaker brackets I purchased from bigblock73. Hope the pictures help. Will try and give some things I found as I went.
The first pick shows using masking tape to mark where the bracket needs to mount so it is "plumb" and not leaning in or out. Sorry but I turned the camera to show full heighth and not smart enough to figure out how to "rotate" the pic.
Second pic shows after I drilled the floor for the well-nuts Jeff supplied with the install kit. I lost one and had to go for a replacement. When I bought a replacement I went up one step in size to a 10-24 size. Mostly because my truck has 1/4" bubble insulation and a rubber mat on the cab floor and the
3/4" screws included weren't long enough. No problem if going to a bare floor. Also I placed a large washer around each well-nut and used sliicone sealer under them.
Third pic shows using masking tape to "spot" where I need to drill for the upper mount screw.
Fourth pic shows the angle bracket after I attached it to the floor and mounted it loosely before I actually installed the speaker bracket. Installed the bracket at the top and then fastened at the bottom. Did have to do a little bit of file work at a spot or two but nothing serious.
More to come, next post.