NOS Mopar Performance longer wheel studs.
 
I forget the exact MP part number for these (as it's no longer on the package) but I bought about 5 sets of these about 25 yrs ago and have used 4 sets over the years, and this is my last set.  
 
Why do you need them and where do they go?

They are for the front of your car when you want to install (for example) a custom rim that requires longer studs, such as those used to go drag racing, or in some cases, road racing. 
 
For all my Shelby/Dodge cars that I take to the track they all have these studs (in the front).  The nice thing is:  you can still run your factory rims with these studs, but when you want to go to the track, you can remove your factory rims/tires and install your custom front rims and slicks.
 
I'm not sure if MP even offers these anymore.  In any case, this is the last set I have.  If you order Qty 1, you will receive all 10 wheel studs shown (i.e.  enough to do the front of 1 car).
 
They measure approx 70.75mm long as shown in the photos.