in New Zealand, you would probably have better luck at finding a kiwi at an auto parts store than a torsion rod boltCan't you go down to the auto parts store and get one ? Napa has them. so does EBAY
http://www.ebay.com/itm/MOPAR-Torsi...Parts_Accessories&hash=item48569094a9&vxp=mtr
Not sure New Zealand has a NAPA. I've got a set of torsion bar bolts and the square pieces they go in but I'm not positive what car they came from. I thought they were for my '69 RR but the square was just a tad too big.