Custom staircase

Q: I am building a custom staircase, with 12″ Aluminum C-channel for stringers. I am looking for solid wood treads, around 2″ thick, by roughly 12″ wide, and 36″ long. Walnut, Oak, or light Cherry are valid wood options.

Can you please tell me if you have anything along these lines?

A: You might want to contact these people who take the raw materials and manufacture it to whatever specs you choose: