I got the alert that my brakes are low in the ol LS. Before I click buy - just make sure I'm not crazy.

I need two of these for the fronts, correct?
(so with pads and rotors about $170)

Bosch 50011458 QuietCast Premium Disc Brake Rotor, Front
by Bosch
Link: http://a.co/9ENmDHt

 

Yes, you are correct, that is for qty 1 only. If it were me, I would prefer OEM. However, if I were on a budget, I would prefer this one over the one you've selected:


The reason is I don't like the rust on the hats, and supposedly this is similar to OEM, which is coated such that it will never rust. I've always felt that rusting on the hats is a sure fire sign that a muffler or tire ship did the job, as it does matter whether the rotor cost them $20 or $60, i.e. they'll use the $20 part, and of course, charge list which is $104 ea....

https://www.lexuspartsnow.com/parts/...512-50220.html

edit: might be nice to have the hardware handy.
bolts are SUPPOSED to be replaced when calipers removed, indie said you could try to reuse and get away with it (@ $7.50 ea list, not cheap)
http://www.ebay.com/itm/LEXUS-OEM-FACTORY-FRONT-CALIPER-BOLT-SET-2001-2006-LS430-90105-14151-x4-/231584100467?hash=item35eb7cf073:g:YhsAAOSweW5VcMl-&vxp=mtr

indie says I'm getting a clunk sound (light clang) on certain bumps, from the selling dealer not using the OEM shims (or any--look at the price and one can see why--they did return all old parts so likely a muffler shop tossed them in the car's past) when they did the brakes with OEM pads/rotors/sensor wire
http://www.ebay.com/itm/322291755300?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
this is the other hardware
http://www.ebay.com/itm/182387050086?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT