Stake pocket plugs / covers ?

[purple gas]

So, I scored a mint Truxedo tonneau cover. It's off an 08 - 13 Ram 8' box.
Width at front was perfect, length perfect, but it tapers about 4" narrower at the back.
No problem, I trimmed down a 2x6 to fill the gap and it will be fine.
It's a budget hobby truck anyways.
Problem is the holes on the fleetsides for the stake pockets are going to let water in.
Does anyone make a fancy plug or cover?
If I can't come up with a plug for the square holes I might fashion a black plastic cover to go down the whole top side.
Suggestions appreciated.