I plan on getting one of their cages in the future and here's my plan:
(unfortunately to do a B pillar tie-in I'll have to ditch the aux tank)
Call Krawlers Edge and ask/buy for a pair (or 4 however many tie-ins you're going to use) of their footplates. That will assure you that the bolt pattern lines up and such.
Here are two kits:
Simple legs and
A Hoop style for the tie-ins.
Since both kits are YOU cut to length, you could add an isolation/sleeved bushing at the rear mounted KE footplate or the frame for the none-hoop type.
Effectively, you don't need a kit as most of these parts are pretty easily sourced and/or self explanatory.
1. Get the KE plates, some strong tubing, sleeved bushing, and some flat plate (the same thickness as your footplates or slightly thicker).
2. Install the KE footplates (for a place holder)
3. Align flat plate stock on frame and C-channel or full box.
4. Weld on bushing tabs and install bushing (for placeholder)
5. Saddle cut your tubing and measure edge center of bushing to center of plate
6. Find the length (and angle) needed to finish cut pipe.
7. Test fit everything
8. Remove bushing and weld on tubing
9. Reinstall busing and weld tubing to KE foot.
10. Remove tie-in and clean and paint/cover whatever
11. Reinstall and Done.