Hi simon,the rover blades come with new bolts/nuts/washers.in your case the blade plate has round holes where as the rover blade bolts have a half flat on the bolt which helps the bolt from turning in the blade plate when doing up the lock nuts.you can use the rover blades but might have to get NEW round nuts/bolts/washers.go to bunnings down the road from where you are,they also have a big selection of mower accessories...ken
