My guess is that the only fences that will fit directly with no drilling are other Ridgid fences, but I could be wrong...there might be some exceptions. If the fence from a Ridgid TS3650, 3612, 2424, or 2412 will fit, it'd be an upgrade...not as good as the better steel t-square designs IMO, but a nice improvement nonetheless. Dunno if any of the similar Craftsman Align-a-rip or Exacta-rip will fit, but could also be worth checking into.
HD has the T2 for $183.33.....great deal on a nice fence that will likely require at least some drilling. The good news is that cast iron drills pretty easily, and you may not need to re-drill over hole.
The Vega fences are pretty easy to install, usually only requiring two holes for the front rail.
The Shop Fox Classic, Saw Stop T-Glide, Jet Xacta, PM Accusquare, and HTC are all robust commercial grade fences that will run a bit more.