Want Gearbox to suit 92 Brumby, also looking for Weber Carby

[Diffy]

Hello.

I'm having some gearbox noise in my 1992 standard EA81 Brumby, and not being as mechanical as I would like, I can't re-build it, and it would cost too much to get the mechanic to re-build it, so I figured I would buy another one, and get the mechanic to put it in. I live on the Mid North Coast, near Port Macquarie, so would prefer something close to home.

Not sure how much one of these gearboxes are worth, so open to suggestions.

Also wouldn't mind a Weber Carby if someone has one lying around?