Unfortunately, the aftermarket locks use the newer keyways, yet include the octagonal key blanks as a disguise. If you have an "A" stamped, you are looking for a square-head B-50 blank as a replacement. However, many aftermarket cylinders are universal and allow the other keyways to enter(which is why I shy away from them). If this is the case, you may get away with ordering the B-10,B-11 blank.
I ran into this problem with the aftermarket cylinders when I was a locksmith.
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2-1962 Lemans convertibles 4cyl, auto
1962 Tempest safari wagon (running project)
1972 455 Formula (tribute)
1962 Skylark convertible 215 4-barrel , auto
2009 G8 Sport red metallic, Onyx leather
Whatever else that make my way into the driveway
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