PartsNMore are Chinese parts and likely the others too. Unless they specifically say they are not. I have used them but the needle tips are what bite, ethanol swells them and they also stick from drying up since ethanol dries up in bowls like 10X faster.
Pretty hard to get needles and I never have had to change them. Dynojet added 'race' needles to their kits but they are crap and I don't use them. If the needles flop loose like supposed to they do not wear enough to change.
Beware of non-Keihin jets, they are often marked wrong and will not flow the same as OEM. I use Honda or Keihin jets, needles, and float needles only and add other maker carb kit parts around them.
Assuming you know that basically any early DOHC 750 kit will work right? K, F, SC. C, all the same but for possible minor jets. 30 mm. carb. The plastic non-adjustable floats will interchange with the metal bendable ones. Just make all four the same. And remove the aircuts, saves money and runs better.