Well advarasi I have done quite a lot of research into this issue and looked at many photos on the internet and come to the conclusion that the original US spec bumpers did have a support arm as described in my original post. I can only presume your rear bumper is not original or has had the support arms removed and the corresponding holes they went through welded up!? My Stainless Steel replacement bumpers definitely have these arms on the front and rear towel rails. One day I will learn to post photos!
Perhaps a USA member might settle this discussion and hopefully supply me with the dimensions for the cut outs.
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