help part # needed = s14 front shock nut & bolt (small o

hey guys, i need the part # for the lower shock bolts for the front struts on an s14. There are 2 sizes, one think large nut and bolt, and a smaller one with a hump in the middle of it. i need the part # for the smaller one. i went to agincourt nissan and their cpu lists both bolts as the same # (the thick one) but it will not fit.

if someone could find out the proper # it would be much appreciated

thanks