I am sure this guy wants a Brooks saddle on his P2C.

I have bought and sold about 8 used saddles on Ebay and broke even most of the time (a few times I actually made a little). Trial and error unfortunately is the only way.

My Cervelo P2SL TT bike came with a Profile Design timetrial saddle. I thought it was just a throwaway and tossed in my junk box. I rode it with a Fizik Arione and eventually with a Selle Italia SLR for quite a while but had trouble with longer rides. One day I decided to put the Profile Design Elite TT saddle back on and it is the best saddle I have ever ridden for longer rides. It isn't coming off. Again, trial and error is the only way.