I bought the "Gasket Kit, Power Steering" (part# 04446-30173) from IronToad.com for $25.50 plus 6.98 shipping. I also replaced:
-PS Bearing, part# 90363-17017 for $10.33 plus shipping, from Sewell. (By the way, Sewell is a good seller and the shipping wait is about 1 week, in case you are interested.).
-Air Control valve (part# 17630-16040) although it was still good (since I had to remove the alternator to do the job so I tried to avoid/delay doing it again at some point later), ($65.02 plus $6.50 shipping, from discounttoyotaparts.com because this is a Toyota equivalent).
-2 vacuum hoses at ACV (parts# 17342-50010, "Hose, air, No.2", $11.35, and #17343-50010, "Hose, Air, No.3", $12.64)(shipping for both was $5.98, from IronToad.com).
I didn't replace the PS pump Return Hose because I made 2 mistakes:
1. Dislodging one of the screen filters at the solenoid valve at the Rack. As I used an old soft toothbrush trying to clean the metal screens at those "windows", and one of the sceen windows just fell off. It seems to me that those tiny rectangle metal screens are badly and loosely attached to those tiny windows of the filter. Avoid touching them even with a soft toothbrush.
2. Dislodging the filter screen inside the PS reservoir by spraying brake cleaner from under the reservoir.
So now I have to use the Inline PS Filter and 2 feet of generic 3/8" PS tubing from AutoZone to get at least 4" straight tubing at PS pump, required for the tiny filter which fits INSIDE the tubing.
(PS inline filters can be ordered from RockAuto.com, part# 20FLT1, sold only in boxes of 12's, about one dollar plus each, plus shipping)
I had to borrow the Slide hammer from AutoZone, buy a 5" vise at Kragen (first vise ever!), and a torque wrench for ~$60 at Home Depot (the strong one you recommended, with life time warranty). (I always consider myself a rock bottom level DIY beginner, though).
I have tried to buy a rebuilt PS pump from AutoZone, but somehow I don't trust the quality of the rebuilt stuffs in the past, and the minute I looked at their pump, I decided not to buy it (although it has a lifetime warranty), and do the rebuild myself just for the fun of it.
About the PS pump rebuild, the tutorials from lexls.com and planetsoarer.com are excellent but to me the guide line from Lexus shop manual is the most important part of the combination.
I'd buy a pump from an online Lexus dealer if I had to do it again.
Good luck :D
Don