If you have the means, build a cabinet to match. If you don't, take some good quality photos of the other cabinets and doors, contact a local cabinet shop to build you a cabinet. Check with a stud finder first to see where the studs are in relation to the space you want the cabinet. You may need to adjust the size of the location to bridge onto a couple studs.
Mounting will need to find the wall studs, and washer head screws into the wall studs should hold fine.
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