Be careful changing rack rods,apart from imperial (MK1) and metric (MK2), there is Burman and camgear racks. Parts are not interchangeable between Burman and Camgear. They are identifiable by the input shaft housing, I think from memory one has a damper cap held in by 2 bolts and the other hasnt, or one has the input shaft bottom bush cap with 2 bolts and the other hasnt, sorry just cant recall, lookup a workshop manual or maybe someone else cam shead a bit more light on the topic.
A new quick rack is about $250-300, and smacka usually has them in stock.