hi,
cant speak for the golf gti but i have done test fit in our polo (without securing it in place just placing it in the reversed position behind the passenger seat). It fits in but noone can sit in the front seat, so would imagine the golf would fit someone in the front but be squishy for them.
Dont think you need extra harnesses etc.. polo has securing bits in the hatch so the straps go over the back seat and into the hatch floor.
polo would also be a pita to get the baby in and out as its a 3 door.
Easiest thing to do is take the baby seat with you and fit it into the car BEFORE you buy it so that you know what its gonna be like.
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