B Blackstar Retro Guru Oct 25, 2012 #1 http://www.ebay.com.au/itm/Seat-post-31-6-x-350mm-alloy-black-/330816895173 When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.