MUMBAI: Amtek Auto is learnt to have emerged as the front runner for the Frankfurt-based KSM Castings, a supplier of light metal casting products for the automotive industry. The deal size is expected to be around e250 million (around Rs 1,700 crore). If the deal goes through, it will be one of the largest acquisitions by an Indian company in the automotive forging space. Incidentally, Amtek Auto had won…