My series 3 has the same setup as the Defender. Shown here:
https://www.lrworkshop.com/diagrams/land-rover-defender-body-chassis/body/cab-body-panel-fixings_52651
You will probably have to drill the holes for the number 2 bolts.
So, 4x no1 and 2x no 8 plus the washers / insulators/ nuts.