Here are details of what I have which might fit your bill. Links to pics of each saddle follow the description..
18 in. Kieffer Rhein AT dressage saddle black. Tree: Medium to Wide (gullet measures 4 3/4" at bearing area between the panels)
Fit a large draft cross. Serial #:111079 8. Seat: Marked (stamped) size 2 or 18 in. 17 in. Flaps. It encourages a long leg with an open hip angle. Extremely comfortable. It is in good used condition with minor fading. Missing one D ring and one billet has some separation but is still strong and just needs to be reglued. Minor nicks and rubs from use. There are no loose stitching or tears apparent. $400.00+shipping calculated by zip code. **Sale Pending** till 12/18/08 Link to pics.. http://good-times.webshots.com/album/568134409ysmFZs?vhost=good-times
17 ½ to 18 in. Courbette Charles DeKuffy dressage saddle set, made in Germany, in excellent used condition. 32cm medium/wide tree. The tree is sound and the billets are in ex. Condition. Small knee/thigh blocks. This saddle encourages close contact with a long leg and an open hip angle. Includes stirrups, leathers and 48 in. Synthetic girth. $300.00+shipping.
Link to pics.. http://outdoors.webshots.com/album/569149249tJIveH?vhost=outdoors
17 ½ to 18 in. Collegiate Jessica dressage saddle (black) with a medium to wide tree. It is in good, used condition with some minor color fading and nicks and rubs from use. The flap length is 17 in. Down from the bottom of the stirrup bar. Large knee/thigh blocks.The tree is sound and the billets are in good, used condition. $325.00+shipping. Link to pics.. http://good-times.webshots.com/album/568207997dwYMfE?vhost=good-times
If you are interested in any of these or have questions, let me know.