I need to replace this seal as its leaking, anyone done one, is it just a push in part or held in with a sealant and can it be replaced without taking out the stainless plate along the bottom of the tail gate. just in case ive tried to undo the 2 large Phillips screws either side of the tail gate catch, but their in tight ive sprayed wd40 on them and was going to use an impact driver on them but don't want to damage them. any advice would be welcome, cheers