I am trying to find replacements for some threaded pieces from my rear apron for attaching the fenders. I think they are called d-nuts, is that correct?
I have seen similar parts on Snyder's, but none explicitly for that area, so I am unsure.
Snyders lists a 5/16-24 D nut for rear fender brace. I don't know the set-up for sure because my 31 Roadster just uses regular nuts. Give Tom a call at Snyder's and he can probably help you out. Good luck.
the Restoration Guidelines state that a 1/2-20 x 3/4 bolt with a 3/8" head was used with 2 flat washers, 1 lock washer and 7/16" nut. (Late 1928 through 1929). This if for the rear body apron and the rear fenders, for those body styles that used a rear apron.
for the tudor rear fender inside aprons to the body. the D nuts ARE 5/16-24 Snyder`s has them. there is three pure fender. the bolt are 5/16 with a 1/2" head.