This is the Factory OEM Rotor KW 5026 that comes with all 4 and 6 cylinder 123ignitions.
Note the step in the ID of the rotor on the right, which matches the step on the post where it mounts. Gives a very positive fit. Always make sure you press it down firmly.
This bottom picture shows the straight bore of other rotors in the illustration on the left.
Not desirable as they have been known to work loose.
If this happens there will be catastrophic damage to the distributor. So make sure it is a tight fit.
Hope this helps
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Had to tap the rotor onto the dist. with plastic hammer due to tight fit.