That eBay item number:132274949930 , or search on Ebay Australia under ‘ speedway car guzzi’
I like the look of that ! Doesn’t use a gearbox, direct drive to rear diff with option of different final drive ratios. Is that a hole in one of the valve covers ?
A guy at ‘Anson Classic Restorations’ near to me is planning to build something similar, using a sidecar body but retaining a single rear wheel.