breather hose leaking oil

[allenying]

hi, my breather hose is leaking oil,

i saw some old threads on here with broken links, so, i was wondering if someone could clarify...

is there a genuine mercedes single piece?
why was it 3 pieces to begin with if the single piece is claimed to be better?

anyone using this one from mercedes source?
.com/store/meyle-turbo-diesel-breather-hose-upgrade

it seems i could just change the elbow and clamps for a few bucks, but would do the single piece if it is in fact an improvement.

thanks!