Carbon seatpost with setback

[exzos]

Is it just me, or is it not possible to get a seatpost with setback in 31.6x400mm ?
Like this one, but it's only 350mm and I need the extra 50mm 

http://www.aliexpress.com/item/New-mountain-carbon-bicycle-seatpost-carbon-bike-seatpost-road-bike-parts-27-2-30-8-31/907638138.html

[bxcc]

http://www.ebay.com/itm/Carbon-Fiber-Seatpost-31-6mm-400mm-Road-Bike-Bicycle-Cycling-Seat-Post-MTB-GO-/281690966349?hash=item419617094d

Different head design but it meets your size requirements.