The top of my rails look the same as yours T22A80, with the 2 raised ridges on my '15 Lariat sport screw 5.5'. The pictures of the Platinums above seem to have a different cap, but hard to tell from the pics.

I like daaaaaan's setup. My concerns are how it will look installed on my style of cap with the 2 ridges, as the rail won't sit flush on the cap. And using steel hardware in the aluminum bed causing corrosion issues (should this be a concern?).