I'm confused. Most seatposts have one or two bolts that go through the post head and into the clamp above from the bottom. These bolts are part of the post, not the sea and usually run from the bottom up. Now there are a few rather creative posts out there but I would be very surprised to see one on a KHS, at least as a stock item. (If this bike is used all bets are off.) Virtually any post you will ever come across will have the same slots for the rails the same distance apart. As said above, this is probably the most standard dimension on bicycles. Every seat works with every post. (The posts may not place every seat where you want it but that is another issue.)

Ben