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The HBL5100R5W link shows it's rated for 347/600 volts, which seems like overkill.
I think you might take a look at the HBL5100R9W, which appears to be dual rated for 100 or 125 amps at 120/208V or 144/250V.
The website has a sales drawing that says the receptacle is 5-1/2" square and the...