Seat Rail
You bike looks like an early model, like mine. I have a '62. I don't see the squared off shock mounts or turn signals. What year is yours? I hate to drill a hole, but it's only one and the rail just looks nice. I'm jealous that you have the front fender rail! I'm on the lookout for one of those! Here's a pic of mine. (FYI - the pan is underneath just in case....I already fixed the leak!)