seat belt preference

[Jeff]

I currently have a 3 point system with the retracting wheel anchored at the back on the hat rack and the belt runs over the top of the seat. I find with the windows open the belt flaps a significant amount. I've searched the threads on this site for info. I'm thinking about purchasing a similar system but putting an anchor point on the ceiling(don't know if I have to weld). Will this flap less? Should I keep the wheel anchored to the back hat rack or move it to the rear floor/ kick panel area? What do people find works best? Thanks. Jeff