Crankshaft woodruff key

These aren't typically wear items, but after 30 years they're not exactly new, and they can get damaged by multiple timing belt changes. Hedge your bets and get a new one. 

For big nose engines only. That's all 1.8 engines and all 1.6es after mid-91. On a 1.6 engine, count the number of slots on the face of the crank pulley - eight is a big nose, four is a small nose.