I would like to know if I buy a stroller only and a car seat, would I be able to put the car seat in the stroller? Would it fit?
I am not sure what you mean. The Hauck Rapid 42 stroller does accept a car seat, but ONLY a Hauck car seat. The fitting car seat is usually included in the Trio Set (3in1) or in the Shop N Drive 2in1 travel system (= pushchair + capsule). Usually, the car seat included is the Hauck Comfort Fix (and it does have an OK ADAC result, no worries).