Don't know if it's any help, but Dorman #610-254 measures 1-5/8
from base of flange to the end of the stud. Dorman #610-323 measures 2-1/8" from the same point. The knurl diameter is .0157
smaller than what is specified for our cars. I've used these in several cars w/out any problems (if you are looking for a commercially available stud). I'd guess most any parts store would either carry the Dorman # in stock or be able to cross their part #. Oh, the 610-254 is listed as the stock size for our cars. HTH