To prevent the tissue squares from snagging or tearing during dispensing

Wheels: Yes

but you can use types that are 2-1/2 inches to 3-1/8 inches in depth by adding the Internal Towel Tray Adapter Kit (part number 5262-25)

2-1/4 inches in width across its top and 3-3/8 of an inch in width across its bottom

Bradley Mills Partition Aluminum Headrail-73"

Wypall White DRC (Double Re-Creped) Wypall Wiper Rolls, Number of Sheets 950 - 05841 Shower Seats To prevent the tissue squaresWypall Wiper Rolls, Material DRC (Double Re Creped), Container Type Roll, Color White, Sheet Size 13 3 10" x 12 2 5", Number of Sheets 950, Ply 1, For Use With Mfr. No. 80579, 80596