Pretty much any transformer rated for 105-120VAC/60Hz primary, and a secondary rated at 24VAC/2A (or greater A) or 24VAC CT/2A (or greater A) or Dual 12VAC/2A (or greater A) will work. Any bridge rectifier or for diodes rated at higher than 1.4 x 24V and a current higher than ~4A. Now, if you are going to add a 24V or two 12V regulators you will need secondary voltages of greater than 24VAC. Say about 28VAC.
Specific component spec's require specific user requirments.
Ken