'74 Z1A VM28SC Needle Jet Question

I have the later version of the 28's (small bowl drain screws). They are stamped 217/0 just behind the spigot. I'm looking to replace the needle jets and have had no luck finding them. Sudco's catalog is very confusing to me (shadetree mechanic) and Z1 Enterprises only offers the early version jets. The FSM states O-8 as the proper size for stock configuration. My jet is only 5/16" long (approx) and is held in place by the main jet holder. I haven't actually removed it. The offering of Sudco looks like it is one piece and the main would screw into it. Maybe that's the way it's done now. Any insight? Thanks and ride safe, Steve

the needle jet is a one piece unit it extends from thebottom up thru the body of the carb the main jet is screwed into it if your not sure what i'm talking about put sudco's diagram on here and i can point it out to you.