Well, I presume they include the star nuts. If not, those are available elsewhere, see Gummi Bear's link.
I would think if the exact length Frame Connectors were available, the SSP connectors would still be available, or at the minimum someone would've figured out that the Frame Connector from X grill from X era would be a suitable replacement.
I think my question is about the length of the available Frame Connectors. I think for one to work for an SSP, it would need to be same or longer length. I suspect that most are shorter.