I had a bit of a trawl around. Some machines have/had vents, others didn't, hence the request for the S/N ........ 8BG02280 is equipped with vent fittings, or at least they are shown in the Parts Manual anyway.The tall ones #8 in the pic are brake bleeders its been a while but I don't believe our F had vents
The long screws number 8 p/n 4e2613 are bleeders machine was sitting for two years and has a prob with brake bypass looks a though they have been filling the reservoir every time the light come on filling the housing with oil to the point oil is starting to come past the pinion seal when i removed the level plug the pressure build up blew oil everywere was when i went looking for the breather hoping it was blocked repairs are going to be done shortly found the fitting we will drill a hole when the frame is lifted for access , the rear diff has two bleeders on the left side about 50mm from the screw is another blank plug would this be the one for a breather.