most of the ones im seeing out there( bargain bin and Ebay) are a single "mast" style for the GPs, however mine seems to have a metal rectangular frame style. Same as the one i tried to remove at the JY the other day. (only had a few minutes)

Single Mast style
http://item.mobileweb.ebay.com/viewi...id=85701591386


Box style
http://item.mobileweb.ebay.com/viewi...id=72841035867

which is the correct style...
local JY charges $27 for these so i might as well get it new... lol