Heres some 11.4" shocks I found on ebay.  they have 2 different springs on them to be similar to a progressive shock.  The guy said the load rating is the regular 440# like the generic shorty shocks but wonder if the progressive spring style would help from bottoming out with 2 people on the bike?   Has anyone tried these shocks or have any experience with them?  



http://www.ebay.com/itm/Shocks-11-4-EYE-TO-CLEVIS-shorty-short-292mm-HEAVY-DUTY-bobber-black-chrome-/230992907000?hash=item35c8400af8&vxp=mtr