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Nah man. 2mm is like two finger nails. Run 65s on those collars.... I ran megan racings, which are also around 63mm or 62mm, with 65 on many track days. dun worry about it.....
Don't mess with the threads.... they are all custom... its a guess on those thread pitches for different manuf.
I also run 65mm 3k helpers on my megans. Also if you are in california, run some needle bearings from summit. But yeah they will work
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 Turn and Burn! 
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