Review on Prime Line Products 6963 Mirror Roller by Daniel King

My old mirrored door guides were warped and rusted so I bought replacement PrimeLine N6877 guides but they require flat/convex wheels and my old doors used concave wheels. There used to be PrimeLine N6870 concave wheels. I have found that the wheel assemblies in both this (6963) and the old 6870 wheels slide out of their housings, the part that screws into the mirror door itself, and the housings are identical so the wheels fit into both housings should fit . Assembly. So I installed the new tracks, took the old wheels out of their housings and fitted the new wheels into the existing housings on the doors and now they slide/roll perfectly on the new tN6877 tracks. Summary - Old caterpillar, concave. Old wheels, concave (N6780) New track - N6877 with slots for convex or flat wheels New wheels (these) N6393, fit perfectly into the old wheel well (N6780) and new track Gold medal with your own hands!