4 point harness with bench seat

[Overdriven]

I’d be tempted to make something that attached to the original 3 point mounting lug too. But I’d probably go from the 3 point mounting lug to the floor with tube the same size as the harness bar. This serves 2 purposes. 1 you can use flat plate to attach to the 3 point mounting lug while keeping the bars tucked. 2 going to the floor prevents the assembly from rotating at all without having to add anything to the walls of the cab making it more easily reversible.

One thing I just want to touch on as it’s important. The mounting point for shoulder harnesses should be as close to shoulder height as possible. When viewed from the side, if the shoulder harness goes down from your shoulder to the mounting point at an angle greater than 15 degrees it will compress your spine during an impact. Less than 15 degrees will just hold you in the seat without compressing your spine.

In the case of bucket seats with harness holes, if the seat is rated to take the load of the harness it’s acceptable to use the holes in the seat to obtain the proper angle. Not all buckets with harness holes are rated to take the load of a harness. Meaning some buckets require a harness bar mounted at the proper height so the seat doesn’t see any load from the harness. But if your bucket seat with harness holes has the proper rating and the holes in the seat give you the proper shoulder harness angle, the shoulder harness mounting point can be wherever you like.