This is pretty cool. If you are looking for a less expensive/time intensive solution to the original problem of PS fluid spray leaks from the reservoir, you can get this from FCPeuro for $1.50
https://www.fcpeuro.com/products/bmw...et-32411128333
Lifetime replacement when it goes bad and it fits just about every car (e46s, e9xs, e70s....) through about 2013 or so, which comes in handy if you have multiples.
One minute DIY consisting of: unscrew cap, roll off old gasket, roll new gasket tightly up to top of cap, screw cap back on. Leaks gone for at least a few years! 😊