Four more auto-parts suppliers agreed this week to pay $30 million in consumer settlements — with one paying an additional $5.9 million to U.S. dealerships — as part of class-action lawsuits that sprung from a massive U.S. antitrust price-fixing probe. Aisin Seiki Co., which ranks No. 7 on Automotive News’ list of the top global suppliers of parts to automakers, agreed to pay $24.5 million in …