intro and saddle prob

[Suechoccy]

Just measured my seatbones by sitting on the floor crouched forward with legs bent. They seem to be 130mm point-to-point.

So does that mean I need a saddle at least 140mm wide, or at least 160 to allow 10mm either side of seatbones?

Sadly the only shop that hires out saddles in Cambridge area only hires out touring/commuting saddles, not racing/tri saddles.

I guess I need a cutout or at least a groove because I'm sitting forward in the tri position.

What's T-shape and pear-shape? Please tell me examples of each and I'll google them.

I think I need a soft padded wide nose too. (Reason being that's when I ride the Madison, it has such a nose and seems comfy on the touring bike).

Of the Selle Italia range, I can see 3 models: Diva Gel, Gel Flow and SLK Gel Flow for women. How wide is the nose (measured across about 1cm back from tip) on these saddles? Are they all the same or are they different? Which has the squishiest nose?

Thanks!

Sue