Both files can be found in the Official Halo Reach Pepakura Files (OHRPF) thread. The Gungnir shoulder used to be called EOD shoulder so you'll be able to find it on the first page. The Recon shoulder is a little trickier to find but if you search the OHRPF thread (use the search thread feature, not the search bar!), you'll find it. It was made by MissingSpartan7 and released on 12-13-10.