Top Yoke Bushes

[Simonic]

I've got the bike in bits at the moment and am getting some parts off for pwder coating. I've pressed the rubber bushes out of the top yoke. This is the bush that the handlebar mounts go thru.
Unfortunatley they were damaged on the way out and both Robinsons and Fowlers are saying that they are not available to buy seperatley.
Has anyone come across this and how did you get around it?
Cheers
Simon