LKQ Corp. has signed a deal to buy Quebec-based Uni-Select Inc. in a roughly $2.8-billion deal that aims to boost the US automotive equipment supplier’s aftermarket business amid a thriving market. Under the agreement, LKQ will pay $48 per Uni-Select share in cash for the aftermarket auto parts distributor. The purchase marks a 19.2 per cent premium over the $40.28 closing price of Uni-Select shares on the Toronto Stock Exchange on Friday. The transaction, which needs shareholder approval, also requires antitrust clearances in Canada, the US and the UK and approval under the Investment Canada Act. LKQ chief executive Dominick…