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7.5" x 10"

As for the rise, there is a nice picture that says it at http://www.boure.com/1650.html#specs

Will do tonight (right now I'm at work). If you want it sooner, send them email. Boure is second only to TE in customer service.

I'm also rather tall and have these gigantic femurs. While...

Other -- Boure Elite.

I have wide sit bones and end up sitting on the edges of every other chamois I've tried(and I've tried a lot). The Boure has a wider chamois. Side benefit is that it also...