I have a Bausch & Lomb Portrait Tessar 1c that covers 11x14 quite nicely. It's a bit modern a lens for wet-plate, but it handles the format well enough. In ultramodern glass, a Nikkor 450-M will do quite nicely. Then there's the old standby 14" Commercial Ektar. If you want to stick to old glass, the Dallmeyer/Voigtlander/etc #5 size lenses usually do the trick.