SX/SXi/SXi Pro drive shaft thread size

im confused ada has 750 listed for the same couplers as the sxr but then they also have a set of couplers that fit only 750 . ski is in storage so hard to look at
 

swannysxr

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Location
Lake orion, MI
I have a few driveshafts from 750 and 650 all are 18mm. but maybe the pro is 20, you'll have to mic it. BTW sweet lookin ski, always liked those graphics. Where you at in Mi ?
 
I know that the threads on the coupler have a inner diameter of 18mm on my 02 pro. I measured a bolt I used to remove my stock coupler from the engine. I can double check the driveshaft tonight but I think its the same as the crank.
 
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