This is from the Sirius websight. If you look at the dimensions closely in MM they are 143mm which is 5.629" close to the 5.5" you are getting. To be sure of the actual dimension I presume you are using a micrometer? Also note in the dwg the housing is slightly bigger than the actual lense, that could accout for the 5.5"
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USN - RETIRED NUKE
Taunton, MA
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