The models of the 500 which I have seen are made by NOREV SA,
70-72 Ave de Bohlen,
69120 Vauix-en-Valin,
France. Any good model shop should have heard of NOREV models.Not brilliant quality though..
(JCS Fiat are not particularly cheap -
I am told they wanted 16kish for the
LHD 500 Lounge they had in their showroom)
Here's a collection of models belonging to a French chap.
Note the 2 new-shape 500s on the left.