I just replaced the panel jig on my ancient Delta bench saw. "Bench saw" is code for bottom of the line table saw. It has T-slots rather than the standard slots that are 5/8 at the top and 3/4 at the bottom. If you are not able to find something better, I have discovered that inexpensive steel shelving rails work pretty well. They are a little tall, so the sled rides a bit above the table, but otherwise 0fit my slot exactly.
While they work, Bill mentions in the panel jig instructions that T-slot rails may be available from some tool sites. Would be interested to know which ones, since I have not been able to find any, even though rails that fit Craftsman or Ryobi should fit mine...
Thanks! ...and if there are not better suggestions, hope the shelf rails help
