if sanders is still open might be able to make some up for you, he did mine with rods down the side and joining bars across to make a box without weighing heaps.
probably some cheaper options, but why skimp on something so critical?
when i replaced my rear bushes i went to a place where my work used to use for parts in wangara hitech brake and clutch but they also do all other parts. i did like a exchange thing with nolathane and got boxed upper arms instead of the flat/thin stock ones. the lower arms were stock maybe give that a shot
---------- Post added 18-12-11 at 22:18 ----------
or these dont know what the quality is like or if its what your looking for
http://www.ebay.com.au/itm/NOLATHANE...#ht_500wt_1054 (http://www.ebay.com.au/itm/NOLATHANE-REAR-ADJUSTABLE-ARMS-VB-VC-VH-VK-VL-VN-VP-VR-/250850631280?pt=AU_Car_Parts_Accessories&hash=item3a67dcde70#ht_500wt_1054)