There are 4 ways of approaching this mod;
1. Cut the wires, & join front to rear, rear to front.
2. Remove the pins & swap their positions - take care that they still lock into the holder
3. buy a plug, socket & set of pins & sockets & take a channel swap lead so you can just plug into the factory loom without modding it - I sell the pins etc - http://www.newministuff.com/new/shop...uctshow&id=771
4. Buy a ready made channel swap loom (All pins soldered) then you can have the job done in under 5 mins - http://www.newministuff.com/new/shop...uctshow&id=745