Problems you will face...
Unhelpful dealers,places online showing stock of an item-you pay but only find out it's out of stock when they refund you a day later.
When I did my car I scoured the net high and low,searched eBay every morning and night for the item by name then finis number.
Eventually I got everything I wanted but very little came from the dealers,my advice is if you see what you want online then buy it while it's there then print the PayPal transaction receipt for your records.
My local parts man is very keen to find parts but there's so many places buying up all the dealers unused old stock there's very little lying about in ford warehouses these days so most of the time he can get me the finis number,the last time he sold that part,the location it's kept in at the main depot but not the part itself as it's long gone.
Good luck.