Update: The first ordered aluminum cover was returned at pick up due to damage. Glad it didn't even ship to me. Waited for a refund. Ordered a second cover.
Niayko Aluminum Engine Valve Cover with Gasket Oil Cap Replacement# 11127512839
Why? Check the review and video. A BMW driver took some time to do a good review. I'll take a chance and check out the same one. I'll do a thorough check on it. Due to the holidays and shipping, I probably won't get to it until NYD. Or late next week sometime. I'll take pictures to post. For now, the X5 parked until I can replace the cover and gasket.