the OEM bolts were never removed when the crank was balanced.
Here are the options for Crank Triggers, they all have there draw backs.
OEM ABA crank mounted wheel.
This was caused by high WHP 9k rpm shifting. The mounting bolts sheared under extreme shock loading on off throttle.
Not typical of OEM street car but high HP racing this can happen.
This happened to me twice before I ditched the OEM setup.
There are a few options for alternative crank triggers.
EURO TDI pulley mounted
034EFI 16v or ABA pully mount kit
Front/rear main seal trigger wheel
This is the piece i had made to fit behind the 1.8T fluid amper that makes it fit a ABA/ABF hybrid
all i have to do is drill the mounting holes after i determine where to clock it.
this piece fits as close to the front main for strength against high rpm oscillation and the mounting
holes are not adjustable so nothing can move it's position.
If you like this option i can have the trigger wheel made locally $185 Shipped