It's not easy to find. The Motor Matrix is found from the main page by going to "Resources", then to "Catalogs, Flyers and Data Sheets". The Tomahawk RMS listing is on the top left of the second page, and the single-use listing is at the bottom of the same column. The quick answer is: looks like just about any AT motor, although if you use a D you'll want to stick with a short delay.