Are you sure it's 14'? I can't find a 14 footer in their line up of metal frame units. 10', 12' and 15', yes. No 14'

Here's one for a 15' pool:
Intex 15-Foot Round (10-inch overhang) Pool Cover, Blue

If you use this brass kit with brass, not brass plated, grommets, you should be able to tie the cover to the frame:
General Tools 1260-4 1/2-Inch Solid Brass Grommet Kit