Hi Grazzaa, Until now, I always presumed that all models of the 45 had the same cutter bearing housings....so I just checked the SB 45 Parts List....You're right, they are different for the 20"....Here are the part numbers....451098 Left hand....451100 for the right hand. These are very old part numbers and Bruce has just run them through the Rover data base for me, and they no longer exist....

You may care to contact Keith at Turf Machinery Services on 0438 357100. He may be able to source one for you. 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