Yeah I've got them on my truck. Good fit, strong and easy to install. I took a rough "ID" measurment of the ring pulled out and came up with 7/8" wide x 1 1/8" high. However, because for the recess in the base you might be limited to about 3/4" high ID. The steel that makes the ring is about 5/16" thick. If you want to take a look at one, Walmart stocks them.
I have not had them freeze up with ice, but I can see how it could happen.
I bought them for my dad a few years back and he uses them all the time. They can get stuck a bit, but a screwdriver will usually pull them out. We always just use ratchet straps or tie down straps, so we don't have to worry about getting multiple wraps of rope through them.