although it looks like the hole on a D2 and a D1 are identical for the grill and headlights, theres allot of similar geometry that is shifted between the 2 you're talking modifying the hood, the sides of the body, mounting hardware, etc. if you're comfortable with that level of metal work and cutting and bending aluminum and you absolutely are dead set on it then go for it. but if thats a stretch for your fabrication skills then i would recommend just replacing your existing headlights with ones for a 99-02 D2 and putting new turn signal lenses on. also for the same money you could plasti-dip your entire truck and make it look way cooler. also check out saudi grill conversions.