The Rhino-Rack RLT506's 80mm tall legs are fastened to your roof through a pair of detachable mounting brackets or Rhino's own longitudinal tracks, and it comes with bolts and brass nuts to connect to the tracks as well as a security head torque spanner.
The RLT500 is an 80mm tall trackmount leg that is only compatible with the RTC and RTS tracks. For increased versatility, you may put your roof rack system along the track.

The legs are sold as a set of two.  The Rhino-Rack RLT506 Legs are secured to your roof with replaceable mounting brackets or Rhino's proprietary longitudinal tracks.

Its high 80mm profile is appropriate for low curved roofs or where a low profile is necessary to level off several bars.

Track hardware bolts and nuts are supplied, as is a 10mm bolt with channel nut for mounting to the bottom of Rhino heavy duty bar.

To assist match current bar levels, 10 mm Leg height spacers LHS ($13pr) are available. A typical rule of thumb is 5 x spacers (50mm).