You have a 2x7 speed system = 14 gears, but the shifters you want are a 2x for the front derailleur, and a 7x for the rear, which is a set.
If you can't find a 2x7 set, then the easiest might be to move to a 8 speed free wheel:
http://www.bikeforums.net/archive/index.php/t-324562.html suggests that you should be able to fit an 8 speed free wheel on your existing hub.
@branwen started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
You have a 2x7 speed system = 14 gears, but the shifters you want are a 2x for the front derailleur, and a 7x for the rear, which is a set.
If you can't find a 2x7 set, then the easiest might be to move to a 8 speed free wheel:
http://www.bikeforums.net/archive/index.php/t-324562.html
suggests that you should be able to fit an 8 speed free wheel on your existing hub.