Fella looking for a Gossy, HJS 784

[Scooter]

Hi all, a guy in WA is looking for a Gossy he used to own and has put an ad on Ebay. It was Blue/white manual with rego HJS784. He sold it in 85 in NSW.
He has offered a decent reward if anyone knows the car and gets him in contact with the current owner and he purchases it. Anybody here know of the car? I know the guy and know his reward is genuine. Any leads appreciated.