Sustainable (green) supply chain management has emerged as a proactive approach for improving environmental performance of processes and products in accordance with the requirements of environmental regulations. Study empirically investigates the construct of and the scale for evaluating sustainable supply chain management (SSCM) practices implementation among manufacturers. With data collected from Indian small and medium sized enterprises, measurement models of vendor and customer participation and implementation were tested and compared by ‘mean score’, ‘t’-test and ‘p’-test. The assessments presented are based on parts of the data and information collected through the execution of the competitive strategies and best practices benchmarking questionnaire from 60 small and 59 medium size enterprises. Study focuses on present scenario of participation of vendor and customer for sustainable supply chain practices of small and medium sized enterprises in India.