What are dimensions of microwave cabinet on a 17B?

[rocky47]

Our trailer is in winter storage at a remote location and we want to add a microwave before a trip in early April. Could someone who has a 17B please send me the interior dimensions of the cabinet over the refrigerator. If it makes any difference, we have the 4 cu. ft refrigerator.
Many thanks.
Bob

[gdmrce]

Igloo cabinet dimensions 18l x 12d (13d w/o door) x 11.5h
These dimensions are for our 2019 17B w/ 4cf fridge

[gdmrce]

Here’s some photos