Johnny Johnny

My boxed rockers from the UK just arrived and it only took about an hour to get them fitted properly and ready for painting. Can anyone give me some ideas as to the best way to mount them? I figure one of the following approaches would work:

1. Rivets all around
2. Some combination of rivets and bonding
3. Sheetmetal screws at the wheel wells and underneath, bond at the door sill

Any experiences/other solutions/tips?

Thanks!