Backplates and bolts

[sciteacher]

Well, I've managed to get one caliper carrier off at the fron (well big son did) but the other has rather rounded bolt heads. They will come off, with effort I suppose, but will need replacing. Can anyone advise me if Audi still stock these bolts? I imagine that they are dirt cheap, but I'd rather replace them.

Also, how is the back plate attached" It all looks a bit cruddy and Haynes is not really helpful. I would like to take them off and refurb them.