Rear leaf spring question

It baffles me why there would be a difference like that in the first place
Thanks TB
Easy, Everybody forgets that A's started out compact & light as possible, the TF6(904) trans, /6 (orig. supposed to be Al-U-minimum), the steering gear Al box, etc. all to
make the new compacts light as possible. The V-8's & larger bodies came way later and the components got upgraded as needed, all early A's have a small eye bolt, but
later Slantys came with smaller bolts still while V-8's got upgraded, later they all had large bolts..........