This ^^^ is correct! They have a completely open center.
Example, RCX coil spacers ARE NOT completely open. You will need to drill a hole to have the line pass through it.
Not a big deal, just one more step you have to add to the job.
This ^^^ is correct! They have a completely open center.Top Gun Customz specifically state theirs are compatible with air bags. I've bought from them before and about to again.