There are two different brackets. One was on the car when it was new to work with the crank sensors available back then. If your car has ever had a crank sensor replaced you need a new one. Any of the fast food parts houses should have one for like $18 with the screw.
Buy the whole thing, new sensor comes with the new style bracket. Doubt you'll find an old style if that's what you are after
( darn it, where 's the flag that says Earl is typing?)