you say its 'badged', but it sounds like there is nothing indicating it really is an auto power bar???? have you tried contacting the PO or auto power? im sure if you further explain what the problem is to autopower they might be able to help you. the PO, probably not so much.
with that being said, if autopower doesnt help you, use a micrometer to measure the holes you need for the bolt diameter. you can then use a pencil or a pen as a gauge how long you need shank of bolts for. dont forget to account for washer and bolt height. tedious, but it will work.
Lucy; 04 manual sportdesign