5R55S Servo colors

[Laga]

I’m looking into getting my transmission rebuilt and doing some research into available parts. I see that the servos are listed under different colors. Blue, orange, and pink. I know they mean different sizes, but it’s not clear if it’s the whole servo or the stem. I tried finding what each color meant, but can’t find anything. Does anyone know how the color system works and what color is stock?