Its not a straight bar with up-turned ends...its go a jog on the passenger side. So you have to perform bends w/out compromising the spring rate. Also...as you can get the Aussie bar (24mm hallow) for say $120..or the BAT bar (22mm solid?) for a little under that...
I think that there are parts you can fab yourself at a shop (trailing arms, caliper brackets, etc..) but anything involving a "spring rate" or rotational resistance involves a little more than eye-balling it...
