s13 rear strut mount stud

[eazygreezy]

Buddy of mine snapped the stud in the knuckle that the rear coilover slides onto. We cant seem to find a part number or anything on it. managed to press it out but need a new one asap. heres a picture to show exactly what im talking about. any input would be appreciated http://zilvia.net/f/attachment.php?attachmentid=102199&stc=1&d=1514179199

[Standard]

First off, tech talk section would be best for this, actually small question thread would be even better! :)

Probably better off just buying another used knuckle off someone. I would assume they could be had for $20 or less, good luck