s2k7,
Need more info; front, rear hub? Miata based, etc? You may want to send slngsht and NVP66S a pm (slngsht owns a Westie and NVP66S, aka Dan, is building a winderful example) as each may be able to lend assistance. Also, here is a link to a build thread that may help (look about 3/4 down the page on the link):
http://www.westfield-build.com/builddiary0603.htm
. . . . . And, Dorman may be able to match your stud, but don't try them tonight, their site is down for maiintenance:
http://www.dormanproducts.com/