so your problem is the door bars are too long?

the front parts look right.

you have to cut the door bars down to fit, I beleive they have to be positioned between your sholder and elbow for drag raging, don't know about track stuff.

Fair enough if it's a road car, but track guys and the NHRA have examined safety so thier methods are probably better thought out.

if you have to miter the ends and weld them in, use this link for the program http://www.ozhpv.org.au/shed/tubemiter.htm