Mazda mx5 and 10 year gift car issue

I purchased the ultimate edition and downloaded all free cars etc. I was left with 2 installation errors on my download queue one for the Mazda and one for the 10 year pack. All cars worked fine in game, but I could not get rid of these downloads in my queue. Yesterday I chose to uninstall the Mazda mx5 one, with a view I would re-install. However the car has now gone from game and I cannot find how to re download. I have left the 10 year one alone for now and the cars a still in game.