What parts are required for lifesteal?

[Lunacy]

Since iceborne i've been missing my 10% lifesteal crutch and is one of the (many) reasons it's been harder than the base game
Still on the way to MR100 and haven't found a single piece of the lifesteal augment (or any augment besides defense)

[Fredericks of Cursewood]

Tempered Nami in the Guiding Lands along with regular Zinogre in the Guiding Lands for the Health Augment. I think that it may change with rarity, but all my Safi weapons needed those.

[mewlynx]

For the first health augment:

- R10: x7 Tempered Rendclaw, x5 Inkstained Oilshell+, x3 Spiritvein Slogbone, x5 Effluvial Frenzybone

- R11: x7 Tempered Silverpelt, x3 Tempered Poisonsac, x3 Spiritvein Solidbone, x3 Slumbering Greatbone

- R12: x7 Tempered Trancehide, x5 Charged Deathly Shocker, x3 Elder Spiritvein Bone, x1 Guiding Reef Dragonbone

[RedViper]

How is it harder than the base game? You can't augment weapons until you unlock tempered monsters, and if I recall it was only with the tempered elder dragons, which are endgame either way. So you had to hunt all the way to the end without regen on your weapons.
Also, what rarity is the weapon you are trying to augment? since they require different materials for each lvl.