I have seen some of those installations and they are not good. For one the belts need to be anchored into the chassis, or at the body mounts which is not available for the center point. Fortunately, Packard used the X-frame which makes that possible.
Next, the seat mountings need to be reinforced because in a serious crash they will fly forward. When that happens, you are experiencing a rear end type collision. As well, if the body mounts are in poor condition the whole thing might break loose.
The third consideration is you should consider a three point system to prevent being injured by the steering column. I knew someone who crashed his modern Lincoln Town Car and was wearing a three point belt. His chest was still crushed and his health went downhill afterward. He lived, but not very well afterward.
And finally consider that when those cars were built the average road speeds and traffic conditions were much different than today.
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