A holder for supporting electrified inserts that may vary in width, comprises a base having a groove into which the insert can be placed. Two or more gaskets can be positioned in the groove with each gasket including a resilient section adapted to engage the insert so as to retain the insert securely in place within the groove. Each of the gaskets also includes an electrical conductor, such as an electrical wire, which may be embedded in the gasket, in a position where it makes electrical contact with the electrical terminals on the insert.