The 2013 Peterbilt calendars are now available for purchse via the truck manufacturer’s website. This year’s calendar highlights the new Model 579 along with several other models. The wall calendar, with six truck images and two months per image, is 28 by 26 inches and costs $15.95. The appointment calendar measures approximately 13 by 10 inches and costs $10.95. Both calendars are available for purchase via the site or through Peterbilt dealers.