End Cap Sizes

I am looking at the new Dennis Kirk catalog at exhaust replacement parts. When they say "End cap, Quiet tip w/4" base and 1 3/4" insert", what is the 1 3/4" measurement for? Is that the measurement across the exhaust opening at the very tail end of the cap? I need to know because I am trying to find a spark arrestor that will fit my GYTR pipe, which measures 1 3/4" across the end pipe opening.

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