If you want to use equal rates of springs. no real point to waste the money on the BB springs than

But see if this helps you
Rear Buggy/SC10 2wd Springs AE
Two red 2.95 lb. springs (#7436)
Two gold 2.75 lb. springs (#7435)
Two blue 2.55 lb. springs (#7434)
Two silver 2.10 lb. springs (#6478)
Two green 1.90 lb. springs (#6480)

Front SC10 2wd springs AE
Two red 3.90 lb. springs (#7430)
Two gold 3.70 lb. springs (#7425)
Two blue 3.45 lb. springs (#7429)

Losi 22 BB springs

Front
TLR5172 Front Shock Spring, 2.5 Rate, Red
TLR5173 Front Shock Spring, 2.9 Rate, Orange
TLR5174 Front Shock Spring, 3.2 Rate, Silver
TLR5175 Front Shock Spring, 3.5 Rate, Green
TLR5176 Front Shock Spring, 3.8 Rate, Blue
TLR5177 Front Shock Spring, 4.1 Rate, Black

Rear
TLR5165 Rear Shock Spring, 1.6 Rate, Grey
TLR5166 Rear Shock Spring, 1.8 Rate, White
TLR5167 Rear Shock Spring, 2.0 Rate, Yellow
TLR5168 Rear Shock Spring, 2.3 Rate, Pink
TLR5169 Rear Shock Spring, 2.6 Rate, Red
TLR5170 Rear Shock Spring,: 2.9 Rate, Orange
TLR5171 Rear Shock Spring, 3.4 Rate, Silver



I have not used any Losi BB springs on the front of the 2wd truck yet, I know on the Buggy if you want to run Red front you need to shave .060" off the shock end eye to allow for the spring being larger. just use 2 .030" limiter washers to keep stock up travel. This is for the Buggy though.