I noticed that many of the saws illustrated in the various manufacturer's catalogs have a pair of holes punched on the ends of the 2 man crosscut saws. It seams as though Dillard made the studs on his saw connection match the spacing of the punched holes on many of the available saws.
On my site examples of saws punched correctly for this type of this connection are found here:
There are additional connectors without handles in:
Saws that have the correct spacing to use this connector type include at least all of the following (there are probably more here that I missed):
However this saw does not have the correct spacing