Welcome to LVC! You'll love it here. There are a lot of knowledgeable people on here to help you.
Sounds like you might "possibly" need a drivers seat control module. They can be found on Ebay and on a couple other places too.
Ebay:
Lincoln mark viii driver seat control module | eBay
Here is a list I have put together for Lincoln parts on LVC :
Here are websites for Lincoln parts and supplier info
Here are a couple places to look for the headlight kits along with searching Ebay. Temple Performance and Super Coupe Performance can help you out. Give them a call to see.
Home
Super Coupe Performance Parts
You can also become a member of Lincoln and Continental Owners Club LCOC, they also carry parts in their advertisements. For $48.00 a yr. you get a magazine, car show events, meet and greets, and a lot of knowledge. The best perk you get Ford X-Plan discount when you buy or lease any new Ford or Lincoln, the more popular the model the more money you save! Members can save anywhere from $700.00 to $7,000.00 depending on the other times of year.
Information about the club is here:
Home - Lincoln & Continental Owners Club
Hope this helps you out, at least it gives you an idea and some what of a lead.
Keep us posted!