I recently purchased two replacement operators (
39-028E &
39-027E). They fit nicely and will work with the windows. However, the plastic wheel on the end of the new operators did not match the existing tracks. The old tracks and old operators had the thin, flat plastic wheel. Now I need to replace the tracks with something that will fit the new operators.
The old track is 14" long and has three holes for mounting. I'm not sure which track from your selections would be the best one to fit the
39-028E & 39-027E.