Good morning people i have a simple question i think .Are the breather blocks up on the cylinder head interchangeable? I have got an old 73 motor that has the big 1 1/2 inch wide breather with 2 pipes coming out of it and i want to change it to the later model narrower single pipe one . Its only because i think a single pipe looks better and i want to neaten up the looks of a cafe racer im building . thanks guys triumph68