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69 left and 70 on the right.
Also the angel of the steering box mount is like 4* difference.

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First that I heard that the angle of the steering box is different on the B-body, thought that was on the E-body or was the A-body....anyway I thought the later '69 B-body K-frame were the same except the holes for the swaybar were drilled or not drilled depending on '69 or '70. The '69 swaybar runs in front of the K-frame and the '70 runs through it.

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Excuss me. The 70B frame is the same as the 70-4E and 71-2B except the box angel is different. The 69 and 70 B frames share the same box angel. Sway bar is the difference making the 70B frame a 1 year 1 model part.
Sorry about that