Kimberwickes are usually used for riding, not driving.
If you are looking for a bit that has a curb and different slots to try, I would suggest a Liverpool. They are extremely versatile driving bits, and you can find them in almost any size and with almost any mouthpiece.
Try Sandee at Iowa Valley Carriage: http://iowavalleycarriage.com/bits.php Her bits are great quality and reasonably priced. If you don't see exactly the size you want, email her.