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Model is the RD53a Quad .step model in EDMS (here: https://edms.cern.ch/document/2363540/1). Scott extracted a sketch illustrating some dimensions in that model. 

Matt has cut glass to the size of quad modules for us to make mounting tooling tests. At Scott's request, Matt measured 10 samples: 

40.91 x 42.49
40.92 x 42.32
40.99 x 42.34
40.84 x 42.50
40.99 x 42.42
40.92 x 42.54
40.93 x 42.57
40.96 x 42.42
40.99 x 42.50