You only need to replace seals if they are damaged or torn. Most modern refrigeration products have moulded-in seals which cannot be changed and should last many years. There is a magnetic strip inside the seal to grip against the cabinet edge.If you can see a gap, try steaming the seal with a small kitchen steam gun - this will soften it and allow the magnet to grip. Finally apply a smear of Vaseline to the sliding edge of the seal (door pivot side) Also a drip of oil on the pivots. If the door will not close tightly the usual reason is that something is stopping it - an extra fat bottle perhaps ? or a misplaced shelf ? Try lifting the door up to check it is not catching at the bottom - if there is excess movement fit a washer on the bottom pivot to raise up.
Austin Seven -Retired Fridge Engineer -after 40 yrs !
November 2011