Ok so theres this part i dont know what its called on the mkI..
but its attached to the radiator hose going to the block from the filler cap!..
i got both of these of an 85 and yet they are different in the neck angle! this was causing my filler pipe to break because of the stress it was causing on it and how hot the car was getting..
Question is why are they different if its the same year! and same month production.

neck angles!