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IIRC, the 68-72 K-H discs had a narrower track than the 73 and up.

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I am not sure which one's you are talking about?
are they avalible still?do i have to change upper and lower control arms?
Thanks

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The 1968 to 1972 A bodys with the Kelsey Hayes four piston calipers did use a smaller ball joint on the lower control arms and upper A arms, different rotors and a different spindle than the later 1973 to 1976 A bodys did As far as the track widths