cut the 1156s wires and solider them onto the 1157 sockets, you will only have the ground and turn signal wire. the running light wire is seperate ,its the brown wire if i remember right that is not hooked up to nothing, it is in the nose piece. you will have to cut it , soldier it to the right side, run a secondary wire to the left side off of it and solider into the other socket. sounds hard but its not, i had the nose off mine the other day, should have took some pics.
you will need to know which wire is parking and which is running light on the 1157 sockets. just hook to a battery and test it before hooking up.