brownells has most of the internal parts you need for your trigger group: http://www.brownells.com/schematics/...ld-sid115.aspx
they also have the ejector spring and rivet. Interestingly enough they don't sell the shell latches!! Once you have the receiver cleaned up you MIGHT consider buying the shell latches from a gunsmith because you need to stake them in place, AND they have to be on the correct side (yes, there is a left and a right). Gun show??