Hi, I've got a Cannondale F700 with Headshoks and a very long stem, which makes for a very uncomfortable ride. Trouble is, finding a replacement that fits the cannondale's odd 1.5" headshok diameter. Ideally, I'm looking for a 100mm or shorter, with a rise of 20 degrees. Anyone have one--or know of where I might get my hands on same? Thanks!