A new old stock distributor cap made by RAVEN reference DT5571 = INTERMOTOR 45771 together with INTERMOTOR rotor arm reference number 4892S (later 48920S) for the following:

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 
OPEL Kadett E  and Vectra equivalent engined models to the above 1988-89