Are the hinges standard? Where could I buy the hinges? AS 2038 toilet seat repair?

SOURCE: How to install Toilet Seat

Use a flat head screwdriver to pry open the plastic pieces that cover the screws. Using the same flat head screw driver, unscrew the large plastic screws holding the old seat in place. There are usually plastic nuts on the underside that you can hold on to while removing the screws. Remove the old seat. Clean the area where the screws were and dry thoroughly. If the new seat has an adhesive pad, remove the covering from the adhesive and put the seat in place. Thread the new screws through the holes and attach with the new nuts. If there aren't new nuts and screws, you can use the old ones, provided they weren't damaged during removal. Snap the caps covering the screws on the new seat in place. Be careful not to over tighten the screws! Since they're plastic, they can be easily damaged by a screwdriver!

SOURCE: I seems that the williamsburg 5395.700.20 toilet

If it doesn't embarrass you, you could take the two nuts off the bolts holding the seat on, put the seat in a bag and take it to a Home Depot or Lowes or Walmart etc and match a new one to your old one. Good Luck

SOURCE: How do I adjust hinges on a soft close toilet seat

it does this get used to it.

SOURCE: How do we replace the seat on a Kohler K-3386-0

Kohler will try to sell you $46 anchor bolt kit 84999 & also there special tool. You should expect that for a $400 toilet.

Try this instead:
1. Use 1/8" drill bit and drill and drill around the bolt until the anchor material can be removed.
2. Carefully clean hole with 11/32 drill to remove all remaining acchor material.
3. Go local hardware store & buy a 10 - 32 3/8"X3/4" rubber expansion plug (make certain threaded part is brass & has shoulder on 1 end), a 10 - 32X1.5" Phillips bolt and couple of small fender washers fit the seat.(about $4 for 2)
4. Assemble carefully not to over tighten and crack the porcelain.

Hope it helps

SOURCE: Need to replace toilet seat

Your toilet is still offered by the manufacturer:

http://www.americanstandard-us.com/toilets/williamsburg-one-piece-elongated-toilet/

Available replacement toilet seats from American Standard can be seen and ordered here:

http://www.americanstandard-us.com/repair-parts/toilet-seats/

You might consider finding you nearest dealer or choose another on-line retailer:

http://www.americanstandard-us.com/dealerLocator.aspx

Before ordering suggest you confirm with American Standard Customer Service the appropriate replacement seat for your model.

http://www.americanstandard-us.com/customerservice/onlineStoreSupport.aspx