Before filling out the form you may want to look through the sample photos to identify your lid model. There are hundreds of different lid photos and dimensions available to help you find the right lid.
Regarding color, white is by far the most common color toilet. Most manufacturers shade of white looks like a "creamy white", it is not a bright white. The next most common color is bone, and there are probably 10 times as many white toilets as there are bone. Bone is a light sandy color. Kohler calls it "almond". If you are unsure, it is most likely white.
Most requests are responded to within an hour. Provide as much information as possible, and I will review your request to see if I have a match in my current inventory. If I do not it in inventory, I will let you know via email. If it is in inventory, I will send an email with my phone number to make payment with credit or debit card over the phone, and also an invoice via PayPal, where you can make a secure payment with debit or credit card or through your PayPal linked bank account. All lids are $50 plus shipping, which is typically $19 for any continental US location. Alaska, Hawaii, and Canada are more. Shipping costs cover UPS Ground transportation and professional packaging to ensure a safe arrival. Item will ship only after I receive full payment. I will provide a tracking number upon shipment.