did the outer ring come off or the entire pulley? did the elostomer between the hub and ring come out? slk32 crank pulley is about 250$ from oediscountparts.com . i have the crank pulley tool to hold it in place during torque sequence. torque is 147 ft/lbs PLUS 90* eat your wheaties

if the crank pulley hub came off the crank you most likely have a sheared keyway and possibly a damaged crank snout. pictures will tell us more