This fellow uses better quality parts and will even price out custom binding posts/wire for you:
http://www.mfspdesigns.com/index.php/en/all-products/switch-box/switch-box-rca-psb2-1r
http://www.mfspdesigns.com/index.php/en/all-products/switch-box/switch-box-rca-psb2-1r