The "slingshot" goalpost, with a single post curving to support the crossbar, was invented by Jim Trimble and Joel Rottman in Montreal, Quebec, Canada. The first were built by Alcan and displayed at Expo 67, the World's fair in Montreal. The NFL had standardized the goalposts in 1966 and adopted the slingshot for the season; the NCAA later adopted the same rule, but later allowed the use of "offset" goalposts, with two posts rather than one (which were the norm prior to the invention of the "slingshot" goalposts). The CFL was the first league to use the new goalposts; they made their debut in the 2nd game of the CFL's Eastern Conference final in 1966 (which was played at Montreal's Autostade as Landsdowne Park TD Place Stadium, the home of Ottawa Rough Riders, was undergoing renovations), and were used in the Grey Cup the next week at Vancouver's Empire Stadium. Three schools in Division I FBS currently use dual-support posts: Florida State, LSU, and Washington State. A special exemption was allowed by the NFL for the New Orleans Saints to use the offset goalposts during the 2005 season, when they used LSU's stadium for home games after Hurricane Katrina.