Before MSR absorbed Moss tents and tarps I bought the Moss 12 foot and 19 foot Parawings. Each has 6 foot or 8 foot multi-sectional poles to support them.
The larger one I use on kayak tours for a dry area for cooking in the rain in places like Glacier Bay NP or for shade in Baja along the Sea of Cortez.
The smaller one I use on bike tours for the same shade or dry space in rain benefits. A side benefit unanticipated is as a water source flowing off the tarp during rain.
The poles came from Easton. Maybe they sell direct to the public. Black Diamond uses CF poles for their Megamid but they are only 66 inches long. Ti Goat in Utah makes CF hiking and tipi poles. They do some custom work and might be helpful to you. Some shelter makers use a pole jack to link 2 hiking poles together to support their tarps, tents and tipis.
See MLD:
http://www.mountainlaureldesigns.com/