You can't get access to the same holes on the driver side because of the air compressor… The passenger side rear mount seems much more robust than the driver's side, mainly because the bolting positions are much better.
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All right - I jumped the gun as well and got mine off eBay and had them shipped to the independent mechanic who does all my bimmer work as well: http://www.ebay.com/itm/171722151678
I asked the seller about longer / additional bolts and he said that he is unable to supply anything else as he is just a reseller.
I will keep you guys posted. The estimate for putting them on has been $200 from pretty much every shop I have asked at. Sounds very high IMHO