Tell you what, I'll take some pictures of a seat I have (C14 - spare seat) and post them here. Give me a few minutes to get that done... Ok, might be more than a few, battery is dead on the phone.
The front of the seat is on the left. Seat is about 31 inches long, 15 inches wide (widest point). About 9 inches at the narrow bits front and rear. I just realized that a picture of the bike sans seat might be beneficial as well. Working on that. I have my custom seat off in prep for an ECU update so I'll take a pic of that and upload it as well.
There you have it. Have no memories of how my C10 seat fit. Too far in the past but hopefully the pictures will help your decision on what to do.