this is mine and on this side is standard
on the other side the stud was snapped, and i never reailsed for a few years after purchase, so the flat head was drilled through and a large bolt with nylock under the wing was used.... just fixing that made a noticable difference.
just doing that and adding the brake bias you can see lower left made huge improvments to sprited steert driving. feels solid and the brakes work... :)
the plate bends over the edge, maybe 1/4 of an inch which will add some rigidity to the panel as well. the lot may be welded or brazed on... hard to tell....the smooth studs i presume are similar to wheel studs with a spline.... finding a replacment was, impossible at the time, i never thought Ahhhh wheel stud, and i had no idea how to get the remains of the old one out.... it was 20 years ago and i was a young man who didn't really think about orginality and the potential future value of the car he was drilling holes in :0 . thinking about it today a big hammer and drift and replacment with a wheel stud would actually work provided the spline section aint too long.