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When changing the bolt pattern from any five-bolt pattern to another five-bolt pattern, the holes could simply be offset equal distance from each other. However, changing from a six-bolt to a five-bolt pattern makes it a little more complicated. The discoloration around the bottom hole in the photo indicates where one of the existing holes was welded shut and then a new hole drilled in the same area. The walls of the original holes are slightly brown (rusty), while the newly drilled holes appear as fresh steel.