Hi Peter,
I bought a set off EBay, they were pretty reasonable. Come in set for each wheel.

[Linked Image]

http://www.ebay.com.au/itm/LAWNMOWER-WHEEL-KIT-FOR-ROVER-LAWN-MOWERS-/181181737345

Last edited by CyberJack; 05/07/17 01:35 AM. Reason: Added image for clarity.