i was under the impression 74 Mk2 fronts were black and the rear (carb side) portion was silver. i still have my original silver rear section, but the previous owner destroyed the front in an attempt to install a mukuni carb and relocate the ignition switch. he basically cut the ignition switch bracket from the housing. i went back to the original twin amal configuration and bought a new (silver-silver) air cleaner assy from old britts - as i recall they sold both black and silver front sections. i since sourced an original part to restore back to original. my friend has a 73 Mk1 with a chrome assembly, but i can't verify it's originality.