Mine broke too, not the same as yours, but I used a cotter pin to keep mine on.
This comment isn't probably going to help you at all now that I think about it.
98 White Z28 A4 / Iron 408ci / 525hp & 485tq
Fast 90/90, TFS 235, 247/251@112, 1 7/8 Headers, Pulley, Custom Catback
2.1 - 60' / 11.8 @ 122mph (traction? not even close)