By "multi-cog bolts" do you mean "torx bolts"?? >> sort of star shaped??

MB seems to use a number of these >> I got a set of torx sockets from :

http://www.toolsource.com/ost/product.asp?sourceid=&dept%5Fid=500&pf%5Fid=57444&mscssid=R4AUE21DQJQH9JUVJF8VXV76KEK660A1