This Turnlock part HSTHGF8288S is a flat grommet to install the stud in the panel and holds the stud in place. Important is that since this grommet will swage 90 degrees, you'll need a protection ring to protect the panel:
turnlock HSTHRES
Material
Stainless steel
Type
Grommet Flat
Headstyle
Flat Grommet
Turnlock can offer you the HSTHGF8288S with Certificate of Quality, Certificate of Conformity and Certificate of Origin on request. Turnlock is offering HSTHGF8288S as factory new.