Agreed with the restorations kits. You can simply make your own kit too by wet sanding with 1000 and 2000 grit sandpaper followed with polish. If it's still not making a mark with the 1000, up it to 800 grit or even 400 grit. Takes time but will save you a lot of money compared to buying full replacements.
If that's still a no go, you can obviously buy a used set of Machs with clear headlights, but you can still buy new Depo replacements. They aren't cheap and most of the time they come without some of the inside guts but they will give you the shiny new looks.
Hatch Nation #13 : Rally Revolution #13 : ROTM Jan '13
I drive a bobble, a square, and a rectangle