Thanks for the reminder about the OFHG! I already have the gasket on hand. I usually have a couple of them "in stock" all the time anyway. It's such a common replacement item that I sometimes include a couple of them when I order parts.
I thought I was getting it for a really good price when I bought this X5, but now I'm not so sure. I always look for cars that I can add value to, and there will be plenty added to this one!
Oh, and I can assure you: just slightly above-average sized balls.