hand tight on the bolts, sure there is a torque spec in the manual but adobe isnt opening and i have no way to know what torque it is with a screw driver anyway.
remember to use sealant on the half moons at the back of the covers otherwise they fall out and you have to buy new ones once it starts leaking, or they fall in, it stills leaks, but could be munched up by the cams.
they simply push into the recess in the covers to fit snugly in place, no sealant neccissary here.
they come in the VRS kits from nissan, so although no part number, they can be bought from nissan direct.
simply remove the centre coil pack covers, and remove the breather pipes at the rear of the covers, then undo the screws along the inside and outside of the cover. lift cover of and replace seal.