Harley-Davidson 1963 FL “Duo-Glide” 1207cc OHV V-twin frame & engine # 63FL7298 The Duo-Glide was so-named because in 1958 Milwaukee’s 1207cc Panhead was equipped with both telescopic front forks and a swingarm rear suspension, the latter’s action controlled by a pair of outsized, chrome-covered shock absorbers. It was a big step forward in comfort for touring riders, who came to revel in the bike’s cushy ‘Glide Ride.’ Many mounted saddlebags and a windshield, and hit the road bound for points u ...