The plastic dishes that first came out were 2 3/8" OD. The metal dishes that came out later were 2" OD. The 2 3/8" are easier to find and is mostly what Primestar used (in the later years).
PERFECT! 2 3/8 is perfect! Now I am just gonna have to find two of them and two more channel masters, or primestar dishes... I am going to make my 2 3/8 schedule 40 mast look like a tree by U bolting two of those roof mounts to it.