How about a call to Curt and see if you could Drill the 2 inch shank with a new 5/8 inch hole to give you your 14 inch,(using the 16 inch version) or 14.5 for a little wiggle room without compromising the strength of the hitch. everyone I have seen I can slide the hitch into the receiver and usually have a few inches either way from where my locking pin actually fits.
just throwing the Idea out, but if Curt or Reese or who ever says no, don't even think about it, if they say yes, any Machine shop can punch it out for you in a few minutes.
(edited for clarity )