supply of spherolastic rubber bearing (silent block) for aar-h type tight lock coupler head for lhb coaches , spherolastic rubber bearing (silent block) for aar-h type tight lock coupler head for lhb coaches conforming to rdso specifi cation no. rdso/2011/cg-03 rev-03, amendment 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 lock coupler head for lhb coaches. as per rdsos letter no. mc/blb/cbc dated: 28.04.2025, silent block should be interchangeable among various make. rdso item id: 3100211 make - gmt/tvs [ warrant y period: 48 months after the date of delivery ] ]