Well from what I could read on the tape measure in the dark and rain, the superdish is approx. an inch larger in both directions. Pretty close, but it is SLIGHTLY bigger.Well that's what I found on the internet. They are pretty close.
I thought I remembered asking why 121 and 105 were not used anymore. The response I got was that the Superdish was too big. I wonder why the Slimline works and the Superdish failed (from a customer acceptance standpoint)