There's an Orara St off Grafton St ... the exchange is at the NW corner of that junction; co-ords are 30°07'53.2"S 153°00'48.0"E. (Given co-ords 30°7'50"S, 153°0'51"E put the exchange in the back yard of no. 10 Orara St, about 125 m NE of its actual location!)