The front shock / spring towers on my '95 2wd F150 were rusty with heavy scale & needed replacement. Since the truck has 64,000 miles, and the rest of the body frame in great shape, I figured it's worth replacement. Here's a few pictures of the right side replacement.
Below is a picture of the coil spring retainer (top of spring)
The hammer tip points to the spot where the brake line & brake hose are joined. There is a spring clip that needs removed after the brake line is loosened. Make sure to use CRC Freeze Off (frees rusted threads), and cover the flare of the metal line with a piece of 3/16" ID rubber or vinyl hose (plugged with a bolt at one end). The capped hose will keep the line from emptying the master cylinder.
Here's the rubber suspension stopper. It's bolted on the underside of the spring tower.
Here's the bolt underside the removed spring tower. You'll need to transfer this to the new shock tower.
Removing the bottom coil spring retainer/washer makes the job easier. A deep well 1.25" socket & long 1/2" drive breaker bar was used.
There are 6 rivets that need removed, 4 on the frame side & two underneath. I drilled each rivet with a 1/8" pilot hole, then a 3/8", & finally a 1/2" hold. An air chisel knocked the heads right off, and a punch drifted out the other side of the rivet.
Here's the spring tower removed. Note the heavy scale, a little picking revealed a hole near the area where the spring rests.
Clean up of the frame is necessary to stop further decay. I used a paint similar to POR 15 and seems to hold up well.