But I have found Kohler to be a top notch organization to deal with. Try giving them a call:
KOHLER Answer Center at
Phone: 1-800-4-KOHLER (456-4537)
Hours: 7:00 AM - 6:00 PM (Central Time) Monday to Friday.
Except their site says they won't be back in the office until the 2nd of Jan.
Hope this helps,