Utilized Vans F-10112-L Strobe/ELT bracket kit for Dynon remote transponder mounting. Match drilled to stiffeners as per Vans installation instructions OP-41. Match drilled bracket to XPDR tray mounting holes. Removed assembly, deburred, dimpled holes for nutplates. Primed bracket and installed nutplates. Installed mounting tray to bracket and clecoed assembly in place to check for proper fit.