My '73 TX650 needs new diaphragms so I contacted JLB Industries which makes these thin membranes but need to know what carburetors I have. My service manual reads BS38 x 2.....but doesn't read Mukoni. I thought most early Yamaha's if not all had Mukoni! The cover over my diaphragm reads "Solex". So need some assistance so I don't waste time ordering the incorrect membrane. Also the Partzilla diagram for this bike shows a rear grab bar/passenger handle (photo attached), but mine did not have this. I know '72 had these vertical bars, but have yet to see one on a '73 or '74. Just looking for someone's expertise on this extra piece of chrome. My actual "grab bar" on the side of the seat (which helps place bike on center stand) is crusty, so also looking for a location in the states that does re-chroming....any suggestions? Thanks & happy riding all.