I have always been wary of mounting to a chimney,but that's just me.
They can be shortened w/ the clips where the straps fold over inside and are crimped.
Be sure to make your measurements w/ the bolts loosened as much as possible while still protruding all the way through the nuts.
Try to get the 3 corners bent in the correct spot and level on the first try before tightening.
Be sure not to over tighten to the point where the brackets start to bow.
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