4-Point Harness on Daytona Seats possible?

Others will comment who've done it. but a comment from the cheap seats would be to be careful with steel bolts and aluminium panels

 

Installing the harnesses in your car is not a problem but allow me to offer some insight. Harness installation is primarily done by track goers to increase their comfort by better strapping them into the seat. If not done with at least a roll hoop, it is extremely dangerous. Should the car overturn, its roof will collapse and snap your neck instantly. Having the stock 3 point seatbelts allow the driver and or passenger to deflect sideways thereby easily saving their lives. I all but live at a race track and have seen just about everything. For this reason when I hop in a car with harnesses and no roll hoop I just reach for the 3 points. No one ever expects to flip but the fact is that there is nothing you can do to stop it, it's over before you know what hit you, and it only has to happen ONCE.

 

When I refer to a roll hoop I mean a tubular structure that will support the weight of the car should the roof collapse in a roll over. The easy way is a single hoop behind the seats however the proper way to do things is a full out roll cage. Certainly this is serious and should only really be used on a full out track or race car. The part you showed is merely a tube that supports the seat belts behind the seats. With regards to the belts, I would stick to the 3 points. Installing 4 points will require visible drilling which will not be reversible later.