180sx rear coilover question

[D-turbo-lad]

got 2 2nd hand sard coilovers last week the bushing was great in 1 and there set very hard on the rear and there is a mad bang'n comming from the rear now and was wondering has any 1 ever got solid bushings made as in plastic 1's cant tink of the name off hand but it dose wear and brake .. any advise would be greatly helped

also coilovers arent seized of leaking ..