The 70 column is larger diameter than a 68-69. The 3 holes are to mount this plastic ring. It fills up the gap from the larger diameter column, then the satin finished horn Switch mount is different on a 70, it has a larger base diameter to line up with the column.
You can use a 70 wheel on a 68-69 if you remove the black plastic ring from the wheel and use the 68-69 horn switch mount.
Yes the plastic fake woodgrain is a different color also.
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