I believe a front alloy brace can be used in the front side of the rear - if that makes any sense.
Look here:
http://www.oople.com/forums/showthread.php?t=287&page=2
He (GlowPlug) suggests running a second (same front brace) upside down as leading brace in the rear, "we use the brace for the leading side in the rear upside down, and use longer bolts with lock nuts (traction tip: don't use any shims) Bolt length is 14 mm."
The front brace has the same hole centers (for stering pins) as the kit BR rear leading brace approx 36.25mm, the BF (I assume an alternative to BR) is nearer 38.5mm.
I am not sure glowplug still makes em, try eBay or DC racing Here:
http://dcracing.co.uk/dcrshop/produc...oducts_id=1174
We have found the ZX-5 robust, run an alloy front brace and keep meaning to fit one in the rear...........spect we are waiting for the plastic one to break.