XP900 Dual Rate Springs 300/400 lbs?

Hey guys i got a complete set of extra fox shocks when i bought my used xp900. They are dual rate front and rear and I know thats not stock. I took the shocks apart to repaint them and noticed the big coil reads 300 and small coil reads 400. Can anyone tell me who built these springs? They were yellow but someone painted them black.

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