My pleasure Gordon!
Nothing is ever simple...some of the tanks obtained from the U.S. stock actually had T66 tracks for a small amount of time and they were changed out for the T80 metal chevron tracks.
The T80 tracks were used the majority of the time. Late in the war some of the RCD manned Shermans had the rubber chevron T84 tracks fitted.
All the modifications are dependant on the timeline of the tanks in Korea.