There is no ready-made solution to get 4 point harness belts into the X3. The Schroth system for the E46 does not fit.

I was looking around the inside of the X3 and there is no way to mount a harness bar to either the b-pillar shoulder belt mounting points or the d-pillar back seat upper seat belt mount points.

What would you think about creating a bar from roll bar tubing that ran the width of the trunk and attached to the child seat teather points in the floor of the trunk. It would have 3 vertical legs that weld onto one horizontal bar. The harness belts would wrap around that bar, pass through the rear and front head rests. From there it would just be a matter of bolting the front belts to the lower stock seat belt bolts.

My reading of the Federal Motor Vehicle Safety Standards is that the teather attachment points must be designed to withstand the same force as seat belt attachment points (5,000 nm I think). In theory they should be safe enough. By using all three you distribute loads across three points thereby maximizing strength.

Any thoughts?

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