Probably a stupid question but...

You need to find the tip diameter of the Shaft you have in now. It will most likely be 0.350 or 0.335. If its 0.335 no problem the new shaft will fit, as that is the size of the new one.
 
As shaft being offered is 0.335, there would be no problem as, if your head is 0.350, then a 'shim' can be used to fill the gap.

Personally, I wouldn't deal with these guys for this sort of item - though I would/do for other things. I'd wonder why this shaft was pulled from a 'New' Driver (possible a bulk purchase of cheaper Drivers and shaft can actually be sold for more alone than the combo, so may not be all that weird) - and would certainly want to see a picture of the tip of the shaft.

Shaft is a pretty popular one and suits most swings. Not quite for me though.
 
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