RCD adjustable fuel pump extension center section. From time to time a racers application can change and possibly the extension has been cut short, new application calls for longer extension. Not an issue friends RBS carries center sections that will put you back at 6.00" mount flange to mount flange.
Center section is made from billet alum. Housing is 1.980" x 5.410" with four 1/4-20 thread holes on one end for the fuel pump mounting flange to mount on. Hole thru the center of the extension housing is 1.380".