I used something similar on my 3.0 CCV. It was a 1/2" conduit ~24" long with the end smashed and a 1/4" notch ground into the end. I caught the notch on the metal flap similar to the one between 11 and 13 above. I was able to push that hose onto my dipstick tube with much greater ease than anything else I tried.

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,