Improvement of connecting trunk with armrest in rear seat of automobile

First of all, this hole, professionally called sled hole, was designed by Europeans to put long sledges or snowboards.

If you want to modify it, you must customize the back seat back.

Why?

Because the strength of the original back seat backrest frame is calculated according to the whole backrest, if it is re-cut and refitted, the strength of the back seat backrest will inevitably decrease. One of the hidden dangers is that the suitcase impact test is likely to be unsatisfactory. (Trunk impact test refers to the damage caused to the rear passengers by car collision and forward impact of heavy objects placed in the trunk. )

If you change it yourself, try to find a bigger car modification company, they will pay more attention to safety.

The above is my personal opinion.