I have been working on the upper harness mounts some time now. The height of the mounts is very important. The minimum required height for SVA/IVA is 450mm above the seat reference point. This is exactly the height of the rear member where the mount are to be welded on. However, with the seats placed and the harness fitted, the harness seems to point upwards about 45 degrees. In case of a head on colission this can cause compression injuries to the spine. Also, it seams that for smaller people the harness interferes with the edge of the harness slot in the seat. Therefore I chose to raise the mount by 25mm. 
Threaded bushes are made, dia 25mm length 60mm, thread M12.
The bushes are fully welded onto the member. In case of a colission, this creates a torque on the member. To prevent this, the construction is strenthened by another new member.
The raised harness mounts finished.
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