Thanks for all of the replies. I'm currently out of town or I would upload some pictures. I do not have HD channels hidden, I do not know the model of my old receiver, I got HD channels about 2 months ago with the previous receiver, and the dish has 3 "pods" - all the same size.
I'm sorry but this is not possible.
The Slimline-3

and Slimline-5

are the only dishes that can pick up DirecTV's HD signals other than the old original

, the Slimline-3 only has 1 pod and the Slimline-5 has 3 pods but they are different sizes, oval, small round, large round.
You are describing this Phase-III dish and it is Ku band only and will not get any of DirecTV's HD channels as of over a year ago now. At one time (over a year ago now) DirecTV had just a few HD channels on Ku band like 1 HBO, 1 Showtime, HDNet, and TNT but that was it and is gone now.

