Hi Boony, and a warm welcome to the OutdoorKing forum. It's great to have another Scott Bonnar owner on board. grin
For us to be able to help you with dating your Scotties, we will need you to post some pics of each machine. Without these we would be just flying blind.
Please include one pic of the front of the machine (cylinder reel) and one of each with the chain-case cover removed. Please also include info from the ID model plate affixed to the mower and also the complete string of numbers stamped into the air cowling of the Briggs engines. wink
Once again Boony, :welcome:
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