I would just check with them to save yourself the running around time. Maybe they will give you the actual o-ring part number instead of the internal number. They might be able to just ship a package pretty cheaply. Post what you find out as I am sure others will need to replace them someday.
Colder Products Company
1001 Westgate Drive
St. Paul, MN 55114
Fax: 651-645-5404 [email protected]