Product review (5 stars): Parts Number for Basket
I have had my freezer for about two weeks and I am very satisfied. To improve functionality I wanted two additional sliding baskets, identical to what came with the unit. It took a bit of detective work but I learned that GE part number is WR21X10208. if you type that into an Internet search engine you will find a variety of stores and prices.

I learned the hard way that the maximum number of baskets is two. The third basket is about one quarter of an inch too wide. However, it fits nicely in the bottom of my refrigerator and is very useful