There is a ”race shop” at each circuit.
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Not for nothing, but let’s just say, like real life, your car should ready be race prepared for whatever event. Also, in real life, if you need some basic parts, there usually are satellite facilities: tyre manufacturers and/or suppliers for one.
Let’s say you need a race part like a splitter. In the real world, other than having spares in the pit garage, teams do have to either leave the circuit and go to a dealer or have someone from their home garage gather parts and have them shipped to the circuit location.
As for the game, it definitely is annoying we have to back out for certain parts we want, but I think PD addressed the annoying “didn’t have the right tyres” and “my car is below weight limit” things.