This seat and lid with hinges fits 500+ series, 500 old style, and 5000 series (bone in color). (Measures 14 1/2" wide by 15 1/2" from front to rear not counting hinges)
For this seat in the color white it would be part number 385343829.
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This seat is a direct replacement. As such, it was very easy to install. My last seat cracked and it was time to get a new one. I'm glad I found this site. They have a wide selection of traveler toilet parts.