Sorry - no. I never found the pole dimensions. My C-lark will be for sale later this summer, as I have moved up to a Ranger 20 and don't have room for the extra boat. Consequently, the spinnaker pole is no longer an issue to me, although it would be nice to include it in the sale.
Enjoy your C-Lark. Mine is fantastic in light winds. Wish I could afford the room to keep it around.
BTW - make sure you secure your centerboard so it won't slide out in a capsize!