Part #707000009 is badly worn, needs replacement, on my beloved workhorse. Aftermarket part seems not available. (will post ISO in Sale, as well) The boot will, eventually, disintegrate and I will likely then do damage to the engine so want to extend its lifetime a little longer.
If anyone has adapted a similar boot to this model, please provide source & suggestions to this email or to this thread.
Thank you!

Found it!!!
The dealer who has had my machine in his shop since the end of February as we looked for a new boot found it on a search through CanAm dealers, but was unable to make contact with various businesses closed in pandemic. He also said he could only find an email, but he got busy and never searched the dealer's Web site where the phone number and online portal were clearly posted.
Yesterday, I texted SK Northwest, Portland, OR and part is being shipped to me today. My contact at SK said they had 2 in stock, selling me one. She also said they have lots of parts for "antique" ATVs.