The title of this thread should be Corner guards not rocker guards. Thou you do need some new rocker guards
I have the shorty ones from PSC. I like them. I got them with the 4 inch round lite. You could get the standard tail light then cut your 2x6 in there. Most are 3/16 any thing more is a waste!
The only blanks I know of are from Genright. But they are BLANK no cut outs of any kind and they are the long full lengh ones.
You could check with Treks,PSC or GR to see if you can get some without the hinges cut, or tail lights, or powdercoat. If not you could get some 3/16 and cut it to to fit the hinge cutouts. Find a shop or someone to burn them in.
If you want I can make you a rear bumper. We can put in whatever lights you like. I kinda like the idea of having smaller 2 inch lights. That would be a unique look. 2 for brakes one for turn. Or all for brakes and turn. Could also put in some back up lights. I could also put in a 2 inch reciever like what I have. Mounting can be done a number of ways. I think the best for yours would be drilling and tapping the back side where it would bolt to the crossmember. It would be invisible on the outside.