You are looking for the Hebie Steering Stabilizer or the new one from Velo Orange. The VO one is the best price if it will fit your frame. Wallbikes price was best for the Hebie.
I got the Hebie ones from Wallbike and Clever Cycles. Contact them both as the stabilizer is not shown on their web sites. The VO one looks like it will only fit older steel frames with small diameter down tubes.
Unfortunately most double kickstands are European designs or copies of them and most bikes in Europe that include them, or that they are fitted to, have a stand mounting plate that is part of the frame. This is a flat plate behind the bottom bracket shell predrilled for a stand to bolt to. I have made my own mounting plates to handle difficult mounting situations of dual leg stands on a couple of my bikes.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/