The product page you are linked to for this question is for the Go Power 200 Watt, # 34282690. The product review video for this does show a measurement you reference of 7-7/16" for length and just under 6" for width.
Both of the Go Power 400 watt units we currently carry, # 34282693 and the # 34282692 have a physical measurement of 8-5/16" length with a width of 5-15/16".
The Duracell Modified Sine Wave Power Inverter - 400 Watt, # DU88FR has dimensions of 6-3/8" long x 5" wide x 2-13/16"... view full answer...
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