Spanny

Hi all my name is Spanny. I'm new here, I'm buying a car off my Aunty, it's been in the family for 14 years, it's a 1994 VR Commodore S Pack and I need to get a few things done to pass a RWC, but I need to get an ABS Module and a Speed Sensor on the gearbox replaced for the ABS or something like that because the ABS light keeps coming on and off, but because the car is so rare the chick from the mechanics place that was fixing everything couldn't get the part in, she had got one in for a VR Commodore but the teeth didn't fit with my car being an S Pack, so I was just wondering if you guys know anywhere I can get the parts for it reasonably cheap. Please and Thank you. Spanny.