After driving for a couple of weeks minus the not real pretty stock hubcaps my silver center caps arrived from fordpartsuk. They fit correctly and cover the lug nuts. However, they are plastic not metal like the in the fordpartsuk.com photo.
They cost about $120 including shipping. I'll still leave them on as long as possible. They do not attach very securely and I expect one or more will fall off. I may add a dab of silicon to try to keep them on a while longer.
The part number is 4447375.
To clarify, yes the covers are called Transit Connect Steel Wheel Covers. See this link:
http://www.fordparts...47375_c_288.htm
The part number in the ad and the one on the Ford-branded bags the covers came in is the same. I told Trevor, the sales rep I dealt with, and even offered to let him use my pictures for the Site to show a correct part. He was very responsive during the sale so let's see if he can get the change made to the fordpartsuk.com page.
One of them fell off yesterday, before I had figured out how to keep them on without using glue. I found it in the gutter near my house, scuffed, but still usable. They are all off for now until I affix them more permanently.