Hello Maurizio,
yes, we are well aware of this, and as we pointed out, these cars are now quite rare. The Lotus is the easier one to find, but still scarce. The BRP-Ford Indy car came in both Pactra (foggy red) and Competition (light metallic blue) versions (with the usual chassis differences). The Ford is the rarest, so far we have been able to account for... only TWO!
Here are the three cars plus the Competition version of the BRP-Ford, as well as their chassis. Sorry for the copyright but our pictures are now copied and published illegally by outfits such as Pinterest and others, so we unfortunately need to protect our intellectual property. It is not the slot racing enthusiasts causing the problem, but Internet thieves profiting from other people's labor.