We need more info regarding your lathe or machine and where you will locate the bearing. I prefer to make my own, tapered collets and then split them with a bandsaw in 2 different directions(4 slots-two each way, alternate the direction).
Your collets are more accurate for you if they are built on your lathe. Naturally, you need a small boring bar, maybe one with changeable inserts from Enco.
best wishes,
Charlie W.