i might not be much help over here in perth but i got mine made up from a car restoration place i gave them the broken mount (+ the one that wasnt) they put it in a mould and bobs your uncle i had some freshly made mounts the guy reckons they'll last 10 years.
i was ringing polyureathane enginers and shht you have to do the ring around but you should find some guys to do it, if all else fails send them over hear i've still got the guys number.