Primary and secondary main jets: bottom of the float bowl
Slow jet: with top removed it's located on the top of the float bowl
Aisan jets aren't readily available that we know of at this time.
If you need to richen your jets (make the orifice bigger) use a drill to widen the hole
If you need to lean your jets (make the orifice smaller) you'll have to solder the jet closed and redrill it
No, this method isn't perfect but it's the best we have to work with. Keep in mind changing the jet size .001" can make a big difference in performance, don't make large jumps in jet size or you risk damaging the engine.