How to choose right footplates for your boat:
If You need Footrest for K1 just buy one in kategory K1 size.
If You need Footrests for K2 front footplates will be K1 size and back footplates will be K2 size.
If You need Footrests for K4 front footplates will be K1 size and rest of the footplates will be K2 size.determined
Now when You have choosen proper size You need to find out:
DO YOU HAVE POWERGLIDE OR OLD SYSTEM? (If you own boat APEX 52, APEX PARA, VOYAGER or CIVETCAT boat model visit category with this name)
Check what kind of rails are installed in your boat.