I'm in the process of building up a carbon synapse frame that I picked up for a steal on ebay. Unfortunately, it was only the frame being sold. I didn't mind at the time because I thought putting a fork in myself would be a good learning experience... However, I didn't realize that the synapse frame has specific seatpost dimensions. I've been unable to find anything that will fit. Anyone have any suggestions before I drop an unpleasant amount of money to get my LBS to order a Cannondale seatpost?