My 1996 ranger has a cap and liner installed that have NEVER been removed The cap is fastened down with the common extruded aluminum clamps.
Due to a project I'm considering I want to get rid of the clamps and bolt the cap down, but do not want to drill holes in the bed.
I'm thinking of using some sort of stake pocket anchor - similar to the magnum clamps supplied with their headache racks. They don't list the ranger in the clamp application list.
Is the ranger pocket the same as an F150 pocket? Since mine have never seen the light of day - - - - -. I'm thinking make a steel "plug" to fit into the pocket, with a threaded hole in the top to bolt the cap down, and bolt the "plug" to the box from the inside. What Holes are available? Anyone got pictures? Mine is a 7 footer so I'm assuming it's got 6 rack pockets - 3 on each side?

 

7ft bed just has the 4 holes at the corners, same as 6ft

There are holes to bolt stakes tight, you should be able to see those inside the bed?
My 6ft has them

Yes you could make stakes that were bolted in and flush with bed top and then bolt the cap to the stake via thread hole
And another thread hole on the side of the stake to hold it down