Just looked into this, seems like it should be part of MZ403 but most of the pictures don't have the springs in the images. There are a few images with the springs shown through google search but the box images I've seen don't have springs.
The mystery continues.
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My Mini-Z Collection: Z Madness
My Lego Habit: FoundryDX
The front black springs as well as the top shock spring included with MR-03 chassis are not sold separately as replacement parts, you can only buy the optional hop up versions. This is mentioned on any version of MR-03 manual's exploded view with part number diagrams.
Just looked into this, seems like it should be part of MZ403 but most of the pictures don't have the springs in the images. There are a few images with the springs shown through google search but the box images I've seen don't have springs.
The mystery continues.
I can confirm that MZ403 does not include the front springs
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