polyurethane bush height diff?

G'day All,

Who has used fulcrum or equiv bushes etc for x/k-member (whatever) to chassis...I�m in the process of dropping in another 8 (a few clearance issues), and was just wondering if they've noticed any reduction in height over their life (including on first installation, noticed a significant difference in height...with what I�m working with, a few mm's is significant).
The reason I ask...Well they appear to be much thicker than original, and by the looks of things- would offset the member from the chassis by a further 5-8mm (as opposed to my warn out orig lot), giving me the required (additional) depth for safe transmission/tunnel clearance, sump clearance (solid mounts to suit etc), wanted pinion angle etc etc. Obviously I�m not to keen relying on a dynamic time-based solution, but I�ve already maxed out the others- hence, the next avenue/s will cost, and reduce the desired outcome.

Any experience with the polyurethane variety (wearing expectancy) appreciated.

Cheers