Brazilian Cherry (Jatoba) Natural (Prefinished Clear) Landing Tread 72 in

This particular product is a landing tread and is normally only used at the very top of the staircase. It is grooved so 3/4" hardwood flooring can be installed behind it. Most installations typically only need 1 or 2 for their install.

You're most likely looking for a "retro tread" which is the same shape as this product but the retro tread is 11-1/2" wide (this landing tread is only 5-1/4" wide). This link will take you to the page with prefinished Brazilian Cherry retro treads:

http://www.stair-treads.com/url/L

In general, a "retro tread" (or "replacement stair tread") is designed to be installed on top of your existing plywood and a "traditional stair tread" is designed to replace your plywood step.