Here's a photo of the seat bottom showing the plastic pieces going the length of the seat bottom. Will the stainless pieces do the same?
photos.google.com
This is one of many pics of another CS that Odenzaal has for sale.
And based on Chris' pics you have to put these on both rails to keep the seat level.
Or at least that's my deduction since I've never seen these until today.
Google Photos

This is one of many pics of another CS that Odenzaal has for sale.
And based on Chris' pics you have to put these on both rails to keep the seat level.
Or at least that's my deduction since I've never seen these until today.