Mumbai, March 18 -- Among the components of the S&P BSE Auto index, Mahindra & Mahindra Ltd (up 3.11%), Cummins India Ltd (up 1.1%),Sundram Fasteners Ltd (up 0.87%),Tata Motors Ltd (up 0.67%),Bajaj Auto Ltd (up 0.61%), were the top gainers. Among the other gainers were Samvardhana Motherson International Ltd (up 0.22%), and Bosch Ltd (up 0.2%). On the other hand, Tube Investments of India Ltd (down 1.65%), MRF Ltd (down 1.37%), and TVS Motor Company Ltd (down 0.98%) moved lower.At 09:46 IST, the S&P BSE Sensex was down 166.75 or 0.23% at 72476.68.The Nifty 50 index was down 59.45 points or 0.27% at 21963.9.The S&P BSE Small-Cap index was down 98.65 points or 0.23% at 41914.1.The S&P BSE 150 Midcap Index index was down 56.24 points or 0.43% ...