The headlining has been trimmed back at the sides and a strip of double sided tape put down to hold the headlining down. The side bars fit over this and get riveted down. If you got your measurements right the side bars should fit snuggly into the hole. Use the holes in the side rails to drill through and put the pop rivets in. Repeat for the other side. The front and rear bars are solid ali and well need clamping down, dont worry they do flex enough. Clamp them down and mark where they will need to be trimmed. I put 2 pop rivets in each end and one about 7cm away from these 2 and then evenly spaced out a few more between these. The reason fro this is that the bar is originally straight and will be contouring to the roof. The same is done on the front and afterwards you should have your complete frame in (Dont forget to pull the headlining under the front and rear bars.
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