does anyone know which lipo pack would fit.

I know the M06 will accept a rectangular pack.

im talking about the m05

m05 takes the rounded lipo. I used the reedy wolfpack lipo and modified the case so the wires come out of the side of it. So any lipo shaped like a NIMH pack works.

The reedy is the one we all have in m05 and lower. Hard to find much better for cheaper that's known good.
Unless your Zac, he's making his own I heard.