you can still get the rear light gaskets from ford,18quid a pair i think,for your smoked ones,as this is where the rain runs down the hatch sill and over the light gaskets,if their perished then the rain gets in.

also mind your shocks are not smaller than stock or them with your 40mm drop springs might be way too much,mine had a 20mm drop on the shocks alone,when my 40mm spring were fitted ,60mm,and not nice,arch rubbing tyre wearing,hard cak.think about some new bushes if it aint been polyeed. take your time too.but not too long else youll go outside one morning and there will be juss a pile of rust on your drive.