Bits snapped off both sides of rear panels

[baconboy]

hi there, getting round to fitting body work & have noticed that both rear panels (The ones that cover the top exhusts) have a little spike or pointy bit that seems to locate in hole on the frame by the engine. These have unfortunantly snapped off somewhere.
Is there a way around this or can someone provide dimentions for new ones to be made?
Any advice greatly received !