I am looking for a T4 or TX mount in a Pentax K mount
There is no T4 Pentax K mount. The K mount did not exist until 1975-76. The T4 lenses pre-dated the K mount. The TX lenses were introduced starting in 1975 and the series included a K-mount. However, there is no Ka mount as the TX series pre-dated the Ka cameras. A TX mount will fit on a T4 lens, however, you will lose one stop and automatic function, which is why the TX was introduced.
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