Getting ready to do this job in the next week or two. The correct spring clamps for the hoses are p/n 32-41-6-751-127 and 32-41-6-751-127 (one each). FCP Euro has a kit containing the reservoir, the two spring clamps, and a quart of Pentosin CHF 11S. The reservoir in their kit is branded ZF, not OE BMW, but is 1/3-to-1/2 the cost, depending where you shop. ZF is very likely the OE supplier anyway, since they made the steering rack, and everything I've read says the two parts are identical (down to "BMW" markings on the reservoir). I'm personally very comfortable going with the ZF part.
If you're really picky, like me, you can also buy the green ring-shaped label for the reservoir cap (the one that says "CHF 11S ONLY"), but it'll set you back about $20; p/n 71-21-2-122-171.
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