Trent - Sorry to hear about the failure. The A Frame Support is determined by the serial number before the date code. There should be four numbers before the "J112". 0000 through 0701 will take #90710011, and 0702-current will take 90710000. If you can't grip the left over stud, you may be able to use and easy-out to remove it. Otherwise you can drill out the entire insert and put on a bracket to hold the vertical support. I found an old post about repairing this issue:
https://www.hobie.com/forums/viewtopic.php?f=42&t=61065&p=291722&hilit=bracket#p291722