Need replacement for the plastic that holds the railing in place

Thanks for reaching out! The plastic piece that holds the railing is a hanging bracket. I believe you can use either the 32-025 Hanging Rail Bracket or the 32-094 Hanging Drawer Bracket.

To determine which of these might be the best fit for your drawer, carefully review and compare the dimensions below. You'll especially want to compare the length and the depth of the bracket.

Profile view of 32-025

Detail of 32-025

Alternate image for 32-094

Alternate view of 32-094