And shoulder bolts proper ones in EN16 are £100 a set.....DONT buy the ebay ones, call me old fashioned but the brakes holding your brakes on need to be up to the job and tested.
Last time we tested some EN16 bolts we got 70 tensile tonnes in shear, the bolts VW supply to attach the subframes to the cars are 12.9 Tonnes for comparison...
Ours are also fine threaded .......you could hang a Mk5 from a museum roof with one of these puppies