PLEASE NOTE this set is for early models Cap GM reference 90297426, not suitable from part-way through 1989 and onwards though the cap looks similar. Best way to tell is to look at the rotor arm which is totally different.
ASTRA GTE 2.0i 16 valve 1988 to part way through 1989
CAVALIER 2.0i GSi 16 Valve 1988 to part way through 1989