I got this from fasteddy's site
www.rcdocuments.com
part #....description .........spring rate..........................................price-------->
5435 Spring, shock (GTR) (2.6 rate yellow)........................................................6.00
5436 Spring, shock (GTR) (2.9 rate white) (std. front 90mm) ..........................6.00
5437 Spring, shock (GTR) (3.2 rate orange) ......................................................6.00
5438 Spring, shock (GTR) (3.5 rate green) (std. rear 90mm) ..........................6.00
5439 Spring, shock (GTR) (3.8 rate gold) ..........................................................6.00
5440 Spring, shock (GTR) (4.1 rate tan) ............................................................6.00
5441 Spring, shock (GTR) (4.4 rate black)..........................................................6.00
5442 Spring, shock (GTR) (4.9 rate silver) (std. front 120mm) ........................6.00
5443 Spring, shock (GTR) (5.4 rate pink) ..........................................................6.00
5444 Spring, shock (GTR) (5.9 rate blue) (std. rear 120mm) ..........................6.00
5445 Spring, shock (GTR) (6.4 rate purple)........................................................6.00