Joined: Jan 2013
Posts: 1,339
Likes: 7
From: Westfield, MA
Bikes: 1983 Univega Gran Turismo, 1970 Schwinn Super Sport, 2001 Univega Modo Vincere, Self-Built Nashbar Touring, 1974 Peugeot U08, 1974 Atala Grand Prix, 1986 Ross Mt. Hood, 80's Maruishi MT-18
The clamps for the handlebars on "slingshot" stems is 22mm in my experience. You may be able to use one of your riser bars provided you can clamp it outside of the 25.4mm bulge. If you look at the original bars, there appears to be no bulge in it. If you measure it at the clamping points that will confirm if the stem clamps are 22mm. Good luck.