mine are warrior nerfs i just did away with the tube that ran across the top of frame i was just trying to give you an idea of how they mounted sorry to confuse ya
they are greydone proline they origanely mounted above the frame with a tube that ran across the frame held by u bolts i just did not like the look so i welded pegs off the fram for the nerfs to slide onto
not sure on the lenth differance but it looks as if you could mount those 450 nerfs to the pegs just chop the 450 mounts and drill some holes but the lenth might kill ya