See my earlier post under Diesel Discussion, (Thanks Barrie for Posting this conversion chart). I just did this conversion last week end on my 300D, it's very simple. No modifications, just make sure you get the connectors with the lights cause you need them. The connectors are numbered 1-6 (you need a magnifying glass if over 40, like me). The only problem I had was the windshield fluid bottle was real close to the back of the headlight assembly, I had to squeeze it in, and I had to buy 4 longer screws for the (side brackets). I did have to buy the bulbs, H4-headlight and H3-fog. Good luck!
2000 Ford 7.3 Powerstroke 4x4
2006 Mazda Tribute
1983 Black 300 D (donated to charity)
1993 Teal 300 D (160K) Sold
"I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY"