I noticed the same problem on my 2002 ES300. The new pads will fit but you'll need to: 1) compress the caliper piston fully back into the cylinder (use an inexpensive brake caliper tool or a ratchet clamp), and; 2) hand squeeze the caliper and caliper bracket together to allow the caliper to slide over the pads (there is a soft rubber boot on the upper guide pin that sometimes needs some "squeezing" to properly align the caliper). Also, be sure to clean and lube up both guide pins with some silicon grease before reassembling. I'd noticed that the upper guide pin and hole had frozen together due to rust build-up. It was hell getting the caliper off (once you swing the caliper up it should just slide right off - mine would neither swing nor slide). The upper guide pin is actually an allen bolt and can be removed for cleaning.
