Classic rear control arm bush question
 

Hi guys, ive recently had an old tired set of sti pink rear control arms blasted and
Powdercoated and im struggling to find a replacement set of polybushes in the right diameter.
The arms ive removed from my car ( my98 jdm sti wagon) have bush housing size of 34mm but the refurbed sti pink arms have a 40mm size housing.
Is this size difference due to them being pillowball? Has anybody had a similar problem trying to find replacement bushes in this size?

Cheers