Indian ThunderStroke - How to Change Engine Oil 

If your drain plugs haven’t been rounded and they’re just stuck, you probably just need a longer socket wrench for more leverage. If your drain plugs have been rounded, and you haven’t removed a rounded bolt before, I suggest just taking it into the shop and let them take it out. Any other part of the bike, you can watch RU-vid videos and try to take out the rounded bolt. But if you damage the part of the bike near the drain plug, that’s a major major repair.

There are plenty on Amazon if you search for “64mm oil filter wrench”