You can buy the replacement clips at your dealer's part store or through Camping World. You will also need some butyl tape as a seal between the clip and the trailer sidewall so the screw holes are sealed. Best of all situations is to get a new clip with the same screw hole spacing. If you go to your dealer, you can take the broken one in to compare.
2015 Jay Flight 32RLDS Elite
2012 Chevy 2500HD Crew Cab LTZ (6.6L Duramax/Allison)
Equalizer Hitch (1200# bars)