J Red: "While there may have been a set of 
                springs that only dropped 1", I don't believe that TRD sells 
                them now. The only spring available in the US from the dealer 
                is the 1" advertised spring (P/N: 48130-AW100) which dropped 
                both of my cars approximately 2.25F/1.75R. BryanH got similar 
                results from the same spring set.
              I have never seen any other spring set, other than the Gymkhana 
                and Rally spring sets in an old TRD catalog. These aren't "lowering 
                springs. I would feel confident telling you that if you order 
                the TRD set from your dealer or Fensport, etc., that you will 
                get the spring set you're after.
              The part number on the springs is different than the set. Both 
                can be verified here:
              http://www.toyota-trd.com/en/strt/s_lowsprng.html
              The front is 48131-AW110 
                The rear is 48231-AW110
              Those numbers should be painted onto the springs themselves. 
                If the numbers match, and you either shorten or replace the front 
                bump stop with a shorter one, you should be there."
               J Red: "TRD USA's part number 00602-48130-003 is the Toyota 
                Technocraft Japan, Ltd.'s number 48130-AW100 which has been in 
                place since 1997, and perhaps earlier. Hence, they are "TRD 
                Japan" springs.
              Those springs list rates of 2.9/5.0 kg/mm F/R on this page of 
                the TRD Japan website, and show a drop of 1.0 F/R, in the 1997 
                TRD All Parts Catalog. In my experience, they drop the car lower 
                than that..."
              BryanH: "My TRD set was purchased new in February 2003 direct 
                from TRD. They lowered the car a lot. Others have put TRD springs 
                in and not gotten much lowering - I'm not sure why. But mine really 
                slammed the car - I had zero fender gap up front. It looked great, 
                and rode pretty smoothly. The spring rates were a good compromise 
                for street driving and weekend racing. But the springs were just 
                too low for their own good. I constantly scraped over speedbumps, 
                the front outside tire would rub the fender during a U-turn (even 
                though my tires were smaller in diameter than stock ones!), and 
                I had insufficient suspension travel up front, which created resolute 
                understeer on the track."
              
            
            TRD w/ Koni yellows, Borbet Type C, 17"x7.5 wheels, 
              Yokohama Parada 205/40 ZR-17 tires [JerRed]
            TRD w/ Koni Yellows, Rota Slipstream 15" wheels & Toyo 
              T1-S Proxes 195-55-15 [BryanH]