PowerBass OE275-GM Replacement Speakers Making any stock factory sound system sound fantastic is now a simple task with our OEM drop-in replacement speakers for many GM, Chevy & Cadillac cars, trucks, and SUVs. PowerBass OE275-GM are designed to replace the factory dash, center, or pillar 2.75" speakers in your Chevy or GMC vehicle. Making for a total solution for overall sound enhancement has never been so easy! With the PowerBass OE Series, there is no need to drill holes or cut wires thanks to our simple plug and play design that matches the factory bolt locations and plug styles for one of the fastest upgrades ever!