BMW - Rear Toe Adjustment Tools

It's difficult to get a socket spanner onto the toe adjuster on the left side of my E87. On a recent visit to a tyre fitter, I noticed that they used long spanners to slacken and tighten toe bolts. I decided to investigate and this is what I found.
The spanner featured in this video is described on ebay.co.uk as "US pro 18mm x 19mm 409mm Flat AVIATION Double End Ring Extra Long Spanner CrV".
BMW 1 Series Mods 116i E87 N45 N45B16 Race Car Build 2004 2005 2006 Paul Offord 116 Trophy 1.6L tire