NOS Polaris exhaust flange. I can't find one with an original Polaris part number. One has the 3081220 written on it. When you search that part number, it shows it was only used in 72. The only singles used in 72, were in the Colt. The 72, 175 had an aluminum flange, so it has to be the 250 single. Besides that, 72 Colt 250 had the odd 71 style Polartone muffler with a headpipe. The parts book shows a 1260248 part number. It has to be it. In 73, they angled the flange down.