Determine the size of the bearing, or remove the bearing you need to replace. Measure the inside diameter, the outside diameter and the overall thickness. All of the bearings in this category include those dimensions. You may search using those dimensions, separated by an "x".
For example: Put 10x19x5 in the search box. You will be presented with all of the 10x19x5 bearings in the store. Align bearings all have a code beginning with "H" and will usually be about half way down the page, but feel free to select the bearing of choice.
Another way is to press Ctrl+F and most browsers will search only this page, find and highlight the search phrase you put in.