Perth-WRX.com - drive shaft extension housing bushing

G'day guys

I'll try and cut a long story short.

I was getting some vibrations reverberating through the car around 85-110kph and knocking / clunking at low speed low load changing gears / getting on and off the throttle. So i decided to remove the driveshaft for a balance the diff for inspection and re-shim as once the car was jacked up it was evident there was excessive play. whilst at it i want to replace the extension housing lip seal due to a minor leak.

after removing the drive shaft and pulling the extension housing seal i noticed the slip yoke has some wear marks and the seal is in good condition. This has taken me down the path of replacing the extension housing bushing however i cant find a replacement for the life of me.. Subaru manual doesn't have it in on there parts list.

If anyone knows where i can find a replacement bush for a 6 speed gearbox i would be most great full. machining a new one will be my last resort.

cheers for your help!!