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I have no idea what the differences are in those since they are afterMEHket and not OEM.
OEM rocks.
The pictures are just ones I found on the internet but I have oem parts here that I am comparing.
I must have overlooked it but didn't see a threaded hole on either rotor head.
It has been a long time since I last changed the cap and rotor but I am pretty sure the shaft of the distributor is threaded to accept the bolt and there is some sort of provision for the hole or some slot on the rotor whereas the lowport design is 360 degrees around the distributor shaft and simply "clicks" on.
Is the trick where a bolt goes through the rotor head and seats against the dizzy shaft pictured?