Snow socks/Weisssocks/similar for 20" wheels on XKR

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Having read the wonderful stories re snow socks of various brands on this website a year or so ago, I bought myself two sets of Weisssocks (Autosocks didn't do the right size) for the front and back of my 1998 XJR. I dutifully carried them around but never found myself having to put them to use.

I have just sold the XJR (but still have the Weisssocks - ping me if interested) and got myself a gorgeous XKR-S (courtesy of Pistonheads Classifieds)... with 20" wheels, and therein lies a problem. I can get Weisssocks for the fronts which are slightly narrower but of course I really need them for the driven rears (285/30R20). I have looked at Autosocks, at Halfords range and at Micks garage but can't find anyone who does them to fit.

Please shout if (a) you've found some to fit this size or (b) I can do some magical calculation to work out that actually one of the sizes available does fit my wheels (this is what happened when I bought my Weisssocks from Roofbox). I'll try Roofbox again but don't hold out too much hope so let me know if you've cracked this.

Thanks,

Nigel