When you do Friend Request (For the HSR-II) I can stick both of the T16 Turbo Rally cars to share, so you can have a go with them and borrow them -
I Don't think the Rally cars will be in the Online Collectors Dealership list soon as they popped up a few months ago -
Used car list - You'll need to find out what game day you are on. And then which master car list you are on.
Then you can see how long it will take for you to find any car in your used car area. This will help you know which cars you need to trade for and which cars you can wait a few days before they appear in your used car area.
I think will get you to the used car lot thread. Very Useful if you want to get untradable cars - as it is easy to race and miss the dy when a certain car is in the Used Car Dealership.