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Well I ordered some 80mm rings for my 74 750K and they are too small. They won't fit around the trip reset gear. So I am going to try some 90mm rings.
I did it on my 76 550f The 80mm interfere with the trip knob.The 90mm works.. but it slightly off center. Isn't noticeable from the outside... and doesn't bother me. I am VERY anal, as well.