Spring bushes - Ex Telstra 4.2 TDi DX ute

[DX grunt]

I took a pack of 12 bushes to the mechanics today to have all the bushes in the back springs changed, but he could only do half of them, because half of the bushes I supplied were too small.

He's not sure why - either am I.

Could it be because of the upgraded suspension? There's 10 springs on each side.

Any help would be appreciated.

[nissannewby]

Its possible it could be the updated suspension but unlikely.

They are different end to end normally.