These self tappers might be ok ( 1.4 x 10mm ) :
http://www.brimal.co.uk/index.php/on...roduct_id=1473
I`m not sure if the diffs even come with the screws !! I bought one of the newer design diffs a while ago and the 4 screws where not included !!
Give Schumacher a ring..
Regards
Jaco