I have an SWR Headlite Amp. The Speakon mounting flange (speaker output) supporting the screw holes cracked and will not hold it in place to the chassis. It's a Standard D-size hole position. Would anyone have a recommendation for where I may find and purchase a replacement for it? (note) The speaker load must be 4 ohms and it is a 4-pole male Connector Type. Thanks in advance for the recommendations.