Hi Tentimes, I have done some research for you, but, unfortunately to no avail. The pulley is no longer available; and from my inquiries, no one I spoke to, could even guess the diameter.
My advice would be to contact Rover (MTD) in Brisbane and ask to speak to someone that has been in the spare parts area for some time...they may be able to give you the advice you need. wink
Maybe one of our members will see this post and have the answer.....Sorry we couldn't be of more help,
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