Slide 3
Once the old fixture has been removed we can see that the body has been molded to pretty well reflect the shape of the backside of original signal light fixture. The body of the new fixture is different and the shape of the molded section must be modified to make room for the large reflector of the new fixture. It almost looks like the engineers had planned for the wider stance of the mounting screws, BUT: Don\'t let the indentations fool you, (They did me) they are not quite right for the new fixtures.
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