The entire series is physically interchangeable and so this TCN2000 can be fitted on the Technicraft TC1000, TC3000 & TC4000 cartridges as well as of course the TC2000 Technicraft cartridge.
If you find this in grey plastic elsewhere on the internet it is a generic conical. We offer the only elliptical solution available anywhere that we know of as of press time. The Technicraft brand was a line marketed and manufactured by Audio Technica for a while.