supply of aar standard cartridge roller bearing (6 1/2x9) class-kaar standard cartridge roller bearing (6 1/2x9) class-k,aar standard cartridge roller bearing (6 1/2x9) class-k complete with backing ring and a xle end cap to nei drg. no. rbsd-7077 revb or latest. or aar standard cartridge roller bearing (6 1/2x 9) class-k with backing ring and axle end cap to timken drg. no.-e-56020 or latest. or class k compact tbu (6 1/2x9) with backing ring and axle end cap to skf product designation bt2-8606 or latest or simi lar. specn. no. :- ab/rb-41-2016 (rev. 1). guarantee/warranty :- the bearings complete and their compone nts (in case supplied individually) shall be guaranteed for satisfactory performance for a period of 48 month s after supply or 36 months after putting into service, whichever is earlier [ warranty period: 48 months after the date of delivery ] ]