I've had good luck with the Rein hoses when that was all I could get but I would avoid Rein as much as possible especially for the expansion tank. To be clear the clip is on the "Standard Automotive" tank but there is no slot for it to engage the lower fitting. I don't think it pays to spend the big bucks on OE in this case because the OE didn't stand up in the first place unless they are being made better?? In the old days change up and updated parts always had a different part number and were pointed out in the manuals but that seems to be less of a practice these days.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)