mystery water leak

A&Q about 350Z
Q:

av been gettin alot of water on floor of my mk 2 golf thought it was commin in thro boot as boot floor was wet found out it was commin in from water scoosher thing on bk window ( sorry for technical gargon ) now a still have this leak but it is focusin its self on the rear half of car between boot and front seats iv lifted carpet and romoved bk seat but still cannot see anywhere water would b comming from but every time it rains a put car in garage and when return in mornin its got a puddle behind passenger seat and small amounts on where the rear seat would b
any help would b gratefull or any ideas as this is just fryin ma box cause am no able to use car when rainin and since a live in scotland it dont help
A:

is it a 5 door? if so take the door cards off and check the plastic vapour barriers are present and intact
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