supply of spherolastic rubber bearing (silent block, rev-03) , spherolastic rubber bearing (silent block, rev-03) for aar-h type tight lock cou pler head for lhb coaches conforming to rdso specification no. rdso/2011/cg-03 rev-03 , amendm ent slip no 1. of july 2024. make of silent blocks should be either tvs or gmt vide rdso letter no. mc/blb/ cbc dt 31-08-2024. item should be procured from rdso approved vendor sources for aar-h type tight l ock coupler head for lhb coaches. as per rdsos letter no. mc/blb/cbc dated:28.04.2025, silent bl ock should be interchangeable among various make. [ warranty period: 84 months after the date of deli very ] ]