05 yz250f aftermarket spring fitment

Just got some new .42 (slightly softer than stock ) springs off thumer talk store :confused:

Upon fitting them i found the springs are 10mm shorter than stock and now when assembled their is 20mm of unsprung fork travel at the top of the stroke (i must of had 10mm already stock )

They are the correct springs and on the chart it has a " *05 requires spacer "

What im wanting to know is the length or the spacer ,is it 10mm to make it the same overall length of the old spring? or slightly longer to take up more of the 20mm freeplay ?


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