supply of relay immune plug in type style qnna1, twin dc natural line, 24v,4f/4b contacts each for lh and rh front and back contacts metal to carbon,complete with plug board retaining clip and connectors confirming to brs: 960, irs:s 60, irs: s 34 irs: s 23 as applicable. the interlocking code for this unit shall be acdhj.rdso/spn/84 ver: 2.0. inspection by rdso.