Lonestar 400ex frame

[duffman1483]

I bought a used 400ex lonestar frame with pro peg mounts, the only problem is Lonestar technical department can't tell me which style nerfbar it takes, as in if it's a 250r style. My 400ex nerf bars with heel guards did not fit and I thought maybe it was a 250r style but before I go blowing a grip of money away I'd prefer to be sure, so yet again I need help! Any input is appreciated!
Thanks,
Ken