supply of brush holder assembly complete without brushes for traction motor type: hs 15250a as per ref. nos. 1 to 19 of clw drawing no. 2 twd 095 090, alt-7 or latest. firms have to supply brush holder assembly with non-metallic spacers as per rdso drawing no. skel-4683 alt. 1 or latest instead of brass alloy metallic spacers ( as per amendment 1 to rdso modification sheet no. elrs / ms / 0329 rev.o dt.18.04.2014 or latest ) . arcing stud b.h side and fixing bracket for rocker ring ( ref.14 & 16 ) are to be supplied as per rdso drawing no.skel-4707 alt. 1 with latest alteration. ( as per rdso modification sheet no. elrs / ms / 0347., rev.o or latest ) . [ warranty period: 30 months after the date of delivery ]