Bottom sash

Please take a look at our 18-047 top sash guide. Although they appear to look the same, there slightly wider and deeper than yours by 1/16". The original mold was owned by Peco which was bought out by Thermotown and have since made changes to the mold. I am afraid there isn't any of the original Peco 18-047 left. A quick solution could be to file down the guides to fit in your sash.