Your no-hole pilots (VM22/210 type) are correct for your '78-'79 type BS38 carbs. The pilots flow only fuel so no air bleed holes are needed on the sides. The air is added to the fuel above the jet after it comes out of it. I guess Yamaha was able to strike a deal probably and get the jets cheaper without the side holes. The larger replacements you get will have side air bleed holes but that's OK, they'll still work just fine. If you wanted to find larger no-hole replacements, your only option would be to scrounge them from a different Yamaha carb set, a set from the XS500. It came with #30 no-hole pilots. Yamaha doesn't sell these jets anymore so, like I said, scrounging is your only option.