Hi Richard, there are a couple of places that can supply Scott Bonnar spare parts and you may be able to get a complete rear roller set for your machine....I don't know what it will set you back though, I will send you a PM with the details. wink
Regarding Protea Turf Equipment, I have made some inquiries, they are a South African company...no Australian dealers appear on their website, maybe you could try the contact link on their site abd send them an email... wink
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin