annab15,
These wire roll out trays can be ordered in different sizes, but are not customizable.
There are several different sizes available. They also come in several different materials and options, like wood drawers and soft close hardware. I would go to the manufacturer's site to see what sizes and options work best for you. Try the supplier we use, they have Budget Friendly High Impact Products.
Their website is www.rev-a-shelf.com.

Hope this helps.


Torry Manzo
Renaissance Kitchen and Home

Come to my showroom to look. Our supply kitchen rack.

I found these at Lowe's here: http://low.es/GFMA5U