I cant help with the specific jig heads these guys were using so well, but large jig heads with decent hooks are avaliable from Bluewater - ARMA jig heads in 56g, 120g, 180g and 280g. Berkley Nitro Elevators are another option that allow the attachment of a hook via a split ring - definitely available online, so you can put the hook of your choice on them. I think they are 1oz, 2os and 4 oz. They might be of help.