Can someone clear something up for me...

I'm getting conflicting results for the volume of the 5'10 Alternator - some websites say 25.9 and some 26.9, on the FW site it has the Alt board page saying 25.9 and the CBD page for the stock 5'10 at 26.9. Which is right and which is wrong?

It's the difference of buying or not buying. Thanks.