If a part is temporarily unavailable, you could substitute it with these parts:
Quality Idle control valve, air supply for Mercedes G-Class 300 G 3.0 170 hp Petrol
Wide selection of new idle control valve, air supply for Mercedes W463 Cabrio 300GE (463.207) Petrol 170 hp, priced from £39.48 to £258.96. Choose from 6 trusted manufacturers.
Idle control valve, air supply for MERCEDES-BENZ G-Class models
300 GD (460,3) OM 617.931
300 GD (463.327, 463.328) OM 603.931
280 GE (460,2) M 110.994
G 300 TD (463.330, 463.331) OM 606.964
240 GD (460,3) OM 616.936
230 GE (460,2) M 102.981
350 Turbo GD (463.320, 463.321) OM 603.972
G 270 CDI (463.322, 463.323) OM 612.965
250 GD (461) OM 602.939
300 GE (463.227, 463.228) M 103.987