Car seats
Check list for car seats    

Seat height:.

knees should be below your hips

Seat position: It should be comfortable and prevent injury.
Seat Angle: It should be about 10 degrees back from the upright position.
Seat back height: It should extend up to the top of the shoulder blades.
Seat length: It should extend to the back of your knees.
Lateral support: It should prevent excessive lateral movement of the hips & lower back.
Anterior support: It should promote the normal lumbar lordosis
Head rest: Ensure it is present and adjustable.
Other factors to consider  
Steering wheel: It should be central and chest height.
Pedal position: it should be central and adequately spaced.
Clutch glide: It should be smooth and easy.
Headroom: It should allow unrestricted movement.