Lost cause
Mine (on a Hunter 29.5) just got yanked out of the mast chocks by the jib lines and slipped quietly into the York River, off the Chesapeake Bay. After a proper burial, I vowed to look for a used one. Alas, no Web site or other source has materialized. If you find one, email me at editor@vagazette.com. As for the specs you seek, check the whisker/spinnaker pole page in Boat US or West Marine catalogs. They're very precise about which pole you need.