Not Sydney but I've used Jet Engineering in Red Hill VIC multiple times for custom length stuff - excellent customer service & very fast turnaround. The last set I bought they had made up & delivered to me in QLD within 3 days.
I sent them an email today with the details, see how I go. Thanks for the recommendation.
I measured them today, original ones (Comp Cams) are 7.390’’. With the lifters adjusted I need 7.690-7.700’’.