if you have or can get access to a welder its really easy to make your own nut strips, just slide some flat bar into the frame and mark the holes, drill the holes with a 1/2 in bit, weld some nuts over the holes, insert strip back into frame and there ya go super easy, i think i used a 3x1/4 flat bar for mine, possibly two inch, but either way super cheap and easy if you got the tools or can get them