"US vs rest of the world" bumper mount strengthening

[tyroguru]

I have a 1973 HLS30 so it has the "5 mph" front bumper design. Where the bumper mounts attach to the wing there are a couple of metal plates (outer and inner) which I assume are for strengthening - here's the front right outer plate:



From the parts diagrams it looks like US and non-US cars had they same part for bumper mounting prior to June 1972. Here's the part from the US version but it looks the same as the European parts diagrams I have:



My question is: what, if any, strengthening on the attachment areas did cars with the earlier style mounts (and the lighter bumpers) have? The wings are pretty thin so I assume they had something? It really doesn't make any difference to anything I'm doing in this area but I ask more out of general interest.

 

[Mr Tenno]

I don't think they have much, since your car is a '73 I think it still has the mounts for the earlier bumpers - they're two captive nuts higher up:

 

[tyroguru]

Excellent! Thanks hugely for the photo. You're indeed correct and the 73 has both mounts - so many holes I didn't realise that these captive nuts were for a different style mount:



I guess they had the cars fabricated like this and then had to engineer in the required 5mph bumper system.