If you wanted a synthetic, you could probably use the Wintec 500 cc and just set the Velcro knee rolls back farther under the flap. That would also work for a leather saddle that has movable knee rolls. The Wintec 500 and Pro ccs run 1/2" big, though. The 16" 500 might fit you better than the 16.5". The Pro Jump, I like better b/c of the sueded material and the dark color. But it only comes in 16.5" as the smallest size. So that's like a 17" cc. I had a leather seat cushion made to put on it to take up the extra space and I like it now, but I would not be using that saddle for shows.
Also, the Pro Jump is more forward flap than the 500 cc. For certain, you'd have to set the knee rolls back on the Pro.