stud screws for rocket cover gasket

ive got a 1991 mk1 golf cab 1.8, im replacing rocket cover gasket but 2 of the stud screws have broke does any1 know were i can get new 1s 'quickly'
 ive tried main vw dealer in bristol they wont have any till wed at earliest!!
    any were in bristol/bath area would be good!!!!!!!