In my research on saddles I have come to discover that the Selle Italia Trans Am I have is the same thing as the Selle Gel Flow (which I was thinking of trying!). It's just a different name.

Also, I read in two different places that the Terry Butterfly, which I was also thinking of trying, is basically the same thing as the Trans Am/Gel Flow. There are different versions of the Butterfly, so I'm sure they aren't all exactly the same, but I guess the dimensions and basic design is the same.

It was a revelation for me. Hopefully it will be for someone else and, therefore, be helpful in some way.