Get off on online and into a cabinet shop where you get better selection, service, and advice.

Barker Cabinets sells RTA cabinets. Ikea, Overstock, ebay all have vanities as well.

I bought one about that size for a guest bathroom vanity. Our carpenter added a little to the sides to make it fit flush against the walls and the tile guy tiled the top. All I added were knobs on the doors -- no drawers in this one.

Online limits you to the fewest choices with options that don't fit your actual conditions. See the ''adding a bit'' to make it fit above. You don't need to settle for putting a round peg in a square hole. Any cabinet shop can get you what you needs, with thousands of choices. And usually very price competitively.

Stock can work fine *sometimes*. The vanity cabinet I bought online was half the cost of having my kitchen guy supply one cut to order. It's in a seldom used plain white guest bath. It's between two walls -- no sides exposed. The four-door cabinet is 48" long. The space is 53". Two 2" 'fillers' flank the front, painted to match the cabinet. Add 53" toe kick, sink and countertop...done!

We were very happy with online cabinets [Barker & Conestoga], but they were the custom-sized and RTA. The quality was top-of-the-line. But that said, you need to be very careful how you measure and order, down to the 1/16 of an inch. It is no doubt easier to just go and buy but after adding a pantry cabinet to our kitchen that was 25% of the remodel cost, we looked for a somewhat less expensive option.