Here is a spring chart with the black(old) and Silver(new) springs.

Front Mugen Spring Chart, MBX6/MBX6T:
• MUGE0558 - Front Spring (763 N/m) Super Soft 75mm, 1.6/10.25T
• MUGE0559 - Front Spring (787 N/m) Soft 75mm, 1.6/10.00T
• MUGE0571 - Front Spring (788 N/m) Soft 1.5/8.25T
• MUGE0560 - Front Spring (812 N/m) Medium 75mm, 1.6/9.75T
• MUGE0572 - Front Spring (821 N/m) Medium 1.5/8.0T
• MUGE0551 - Front Spring (840 N/m) Medium Hard 75mm, 1.6/9.5T
• MUGE0573 - Front Spring (857 N/m) Hard 1.5/7.75T
• MUGE0552 - Front Spring (868 N/m) Hard 75mm, 1.6/9.25T
• MUGE0574 - Front Spring (896 N/m) Very Hard 1.5/7.50T
• MUGE0553 - Front Spring (900 N/m) Very Hard 75mm, 1.6/9.0T

1.5 Silver – 1.6 Black


Rear Mugen Spring Chart, MBX6/MBX6T:
• MUGE0561 - Rear Spring (680 N/m) Super Soft 86mm, 1.6/11.25T
• MUGE0562 - Rear Spring (699 N/m) Soft 86mm, 1.6/11.0T
• MUGE0563 - Rear Spring (719 N/m) Medium 86mm, 1.6/10.75T
• MUGE0554 - Rear Spring (740 N/m) Medium Hard 86mm, 1.6/10.5T
• MUGE0575 - Rear Spring (758 N/m) Medium 1.5/8.50T
• MUGE0555 - Rear Spring (763 N/m) Hard 86mm 1.6/10.25T
• MUGE0576 - Rear Spring (788 N/m) Hard 1.5/8.25T
• MUGE0556 - Rear Spring (812 N/m) Very Hard 86mm, 1.6/10.0T
• MUGE0577 - Rear Spring (821 N/m) Very Hard 1.5/8.0T
• MUGE0568 - Rear Spring (850 N/m) Mega Hard 86mm 1.6/9.75T
• MUGE0578 - Rear Spring (857 N/m) Mega Hard 1.5/7.75
• MUGE0569 - Rear Spring (885 N/m) Ultra Hard 86mm, 1.6/9.5T

1.5 Silver – 1.6 Black