If any of you are unlucky enough to end up with a RB26 power steering pump on RB20/RB25 (you'll know cause every single other belt # mentioned will be too short -- and the PS pump pulley is 4 rib while your crank pulley is 3 rib) here's what you do...
Go get a 90-96 300ZX N/A power steering pump belt! It's a 36.5" 3 rib belt, also used on the Q45 and J30. Gates PN is K030365. Fits perfect and you shouldn't have to slot your PS tensioner at all.
My setup: RB20, RB25 crank pulley, RB20 ps pump bracket/tensioner, RB26 pump