All requests for car models go in our Suggestions Hub where we monitor voting per model:
Cars & Brand Parts > Car Voting - FM
The topics that match those models:
Similar models have the tag GT1-racing
You can also suggest fm-Update-Themes for something like a GT1 month in the Motorsport Features > Gameplay section of the THUB. Here’s an example:
We keep requests for additions or changes in the Suggestions Hub so that the Discussion sections can be used to discuss game content that currently exists in the game.