If your Super 55 is a true 'Improved' Super, it will have everything John mentioned. They started making these at start of 1957, but the model year actually began November 1st, so you could have a 1957 model that was built in 1956. The fenders embossed with &quot;OLIVER&quot; will be less common, but they did use them on the early 550s, but didn't paint the letters on them.

In the picture of my Super 55  below, you can just make out the fuel fill cap behind the exhaust pipe.