I had an accessory that required six studs to be held in place.  This is a sleeve you can put on the L-Track studs to lock them in place making installation much less of a hassle.

There are three versions, a flat version, a thin flat version, and one with a 10 degree slant.  Most people will want the thin flat version.  The slant version was needed for a specialty accessory for the Cybertruck which has a 10 degree slant to the inside walls.