I ordered this bolt kit when I started the project as well as additional
oil pan bolts.
http://store.nutsandbolts.com/hardware-assortments-0015.html
 
It has been very convenient to have an assortment on hand at the hanger.
Of course if I do not have the correct size I just walk over to Mark S.
hanger and get one of his.  :)
 
Bobby