Needle part number ??

[JR Hammer]

So I'm following the guide for VM34 that grizz sent me and the baseline startup list for brass includes the 6F9 needle. I have been poking around on the web and found 6F09 needle--- is this the same as 6F9 or not?

also, what will determine which needle jet 159p5 or 159p6?? how are they different??

thanks in advance, this forum rocks!