Are you sure its not 1 1/8"? Weird size...
Does your boat struggle with that load? The new "wakeboard" props are 14.5 x 14 and are made for vdrives. I've got a 4 blade on my boat tho... mine is acme 537. 13.5x16 not sure what you should have. hit up karl @ boarditup or Eric @ OJ props