Last week my microwave oven SIEMENS HF 17056/01, which was installed in a Alno kitchen in 2001 as built-in device broke. The old and SIEMENS microwave had the nachgemessenen Dimensions B: 46.5 cm x H 29.0 cm x D: 32cm. The Hole in the kitchenette is a stainless steel frame of B: 29,0mm framed: 46,5mm x H. Since the visual appearance, utility, color and dimensions of the Bosch angegbenen HMT75M451 100% identical to the Siemens device was, I've ordered the same. But now it turned out that the front of the Bosch HMT75M451 only B: 46.0 cm x 26,0cm weight. This means that you now have a 3cm slot above the microwave oven and can see into the bay.
