I took the tuna can turnsignals off of the front of my truck. The darn things were not mounted straight on the fenders anyway. One was forward of the other as you looked across the hood. Looks much cleaner now.
The front parking lights are wired up so they come on with the headlights and also are used as turn signals. It took an amber 1157 (double filament) and a new socket to handle this setup.
On the rear I added the LED's to the bedroll. The LED's are hooked up directly to the stop and turnsignals. They work great with no change to the flasher unit. My wife followed me home when I put them in and said they really added to the visibility of my truck at night. It's kinda like a third brake light - up nice and high with turnsignals.
I know they sell kits to do this LED add-on ($70?) but I got it done for the cost of the bulbs, the sockets, a little wire, and some solder. To place them in the center of the bedroll I used pipe insulation that fits around pipes and is made of grey polyethylene(?). Rick