Rear shock spring internal size

Does anyone know the internal ID of the rear shock spring on an 08 WR450?

I know RaceTech quotes it a 63.4 / 60.6mm

I just need to know if I can use a std off the shelf 2.5" ID (63.5mm) without issue, as I can get them for a lot less £'s than the propriety mx springs

TIA

Well for anyone comes across this thread in future

Top shock collar measures 59.95mm dia

Bottom collar measures 58.00mm dia

A std off the shelf 2.25" (58.5mm) ID spring has an Id of 58.5mm -0.5 +1.5mm, so I'm going with a top tolerance spring, and gonna machine the top collar slightly just to get the clearance

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