Sourcing a Solid Cast Iron Extension Wing for Unisaw

I’m looking for a good source to add a CI extension wing to my Delta Unisaw like this one: http://www.toolking.com/brand/delta-tools/delta-saws/delta-saw-accessories/delta-36-937-10-inch-universal-cast-iron-table-saw-extension-wing/ but they seem either out of stock or out of production. The most current part # seems to be A24617. Anyone have info. on where a good source for one of these might be or know of anyone who’s got a used one they’d be interested in selling? I need the kind with the squared corners because I’m replacing the original wing with this one and then attaching a Bench Dog Router Table extension to that. I’ve done a bit of checking around on ebay and CL and they’re not too plentiful.

Thanks!!!