This head unit spring is suitable for Mimaki JV3 heads printers. This is the original Mimaki part (number M800632). This part fits the head frame.
 
Printer compatibility
Mimaki JV3-130S
Mimaki JV3-130SL
Mimaki JV3-130SP II
Mimaki JV3-160S
Mimaki JV3-160SP
Mimaki JV3-250SP
Mimaki JV3-75SP II