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Metric Size Conversion

52mm = 2 1/16" (2.047")
54mm = 2 1/8" (2.126")
80mm = 3 1/8" (3.150")
85mm = 3 3/8" (3.346")
100mm = 4" (3.937")

Many of our gauges, senders, and mounting accessories list the metric mounting hole size.