Medium and I would get more than one since they’re cheap. I think Walmart sells a 3-pack.
For padding I use neoprene that I cut from a can koozies. The link shows what they are and you can also get them cheap at Walmart.
Can kozzies. Why didn’t I think of that. Just cut the bottom out and slip it on, no wrapping necessary.
2003: 6X5 2010: 7X7