My 40 year old horizontal sliding windows need some replacement wheel assemblies and and need to replace the hard plastic sliding surfaces. The slide surface is 3/4 inch wide and about 1/8 inch deep at the edges with a raised middle ridge sitting over a trench to remove water through weep holes. The length varies in the seven windows from 46 inches to 100 inches. The wheel assemblies are a single wheel unit with two per window. The surrounding wood in some of them has gone away.
Thank you for your help,
Travis