Can't find toilet seat!!!!

I have a Kohler Wellington toilet model K4519 (discontinued model) with a round bowl and I cannot find a toilet seat to fit. Kohler customer service was of no help at all. The standard size round seat you find in the stores is too short. Measuring from the front of the seat to the middle of the bolts is 17".

Anyone have any ideas where I can find a seat to fit?

K4519 is the tank, the only round front bowls it was paired with was the
K3521 http://www.designtool.kohler.com/us/detail.jsp?item=9635802
and the
K3535 http://www.designtool.kohler.com/us/detail.jsp?item=9639902
if it is a "Round front" both toilets recommend the K4662 seat http://www.ca.kohler.com/onlinecatalog/pdf/1031217_4.pdf
Now that seat is 15-7/8" their "Elongated seat" is 17".

I think you are maybe mistaken and it's a elongated toilet you have and that is why Kohler is not finding the right seat.

might also google Church toilet seats; i've found some to fit old one piece kohlers there.