5 1/4 wide by 3 1/4 deep,the prices i've seen at verious retailers are all within a doller or so of each other,so palcoelectronics,pacetronics,cbsforless have them around 34.95 and can get them to you fairly quick.
BTW: I had an old rat shack one and the sizes are real close,hope this is what you needed.
CDX-424 Standing by
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