They look like pop rivets, but have 3 legs coming from centre. Looked high and low but no one can tell me
Stuart 1998 LRO magazine's G4 Freelander 1 replica
The type you are looking for are LSR (Rivet with load spreading characteristics for use in soft, friable or brittle materials); I have found some here;Rivetwise LSR Rivets
Might take a bit of searching to get a small quantity thou. The ones on the 03 plaque have a diameter of 12mm on the outer side.
Ant G4 Ownersclub Internet / Membership Officer-----------------------------------------------------------------------------------2002 G4 Discovery II V8i ES - 2003 Event Stage 2 [Film Crew] FleetNo. G4SAF12 / Vehicle No. 92 / Reg No. CA490.008 2008 G4 Freelander 2 TD4 HSE - 2008 Mongolia Reece Reg No. 4759 YbP1994 Range Rover Classic V8 3.9i (Soft Dash) 1998 Freelander 1.8 XEi 3Dr1983 (Rebuilding) Series 88" 2.25 County Station Wagon