27. VALVES, INLET AND EXHAUST
17 90322697 642858 VALVE,EXHAUST,STD. (LESS IDENT) 8
17 90322698 642859 VALVE,EXHAUST,0.075 MM O/S (IDENT K1) (NLS.- NO REPLACEMENT PART) 8
17 90322699 642872 VALVE,EXHAUST,0.15 MM O/S (IDENT K2) (NLS.- NO REPLACEMENT PART) 8
18 90322694 642758 VALVE,INLET,STD. (LESS IDENT) 8
18 90322695 642726 VALVE,INLET,0.075 MM O/S (IDENT K1) (NLS.- NO REPLACEMENT PART) 8
18 90322696 642727 VALVE,INLET,0.15 MM O/S (IDENT K2) 8
19 90322032 642242 SPRING,VALVE 16
20 90322031 642302 CUP,SPRING 16
21 90097110 642367 KEY,VALVE STEM 32
22 90281144 642963 WASHER,VALVE (NLS.- NO REPLACEMENT PART) 0
22 90285797 642964 WASHER,VALVE (NLS.- NO REPLACEMENT PART) 0
23 90215296 642527 SEAL,VALVE STEM
Part 23, one part number listed for all ranges of astra,cav,calibra with 20xe and c20xe with standard guides.
Then sbd do a smaller valve stem seal for there bronze valve guides.
http://www.sbdev.co.uk/Camshafts/2L_Valve_Train_Components/2L_Valve_Train_Components.htm