Long Reach Valves For 88mm Rims

Having a bit of trouble getting suitable long reach valves to fit my new tubs. The tubs are continental sprinters and i have tried using Token 72mm extension valves but they dont close tight enough to the valve on the tub and start to leak air . Also tried Topeak but found them to be totally useless.
The only type available from continental are 42mm and these are too short for 88mm section rims .
Anyone got any other suggestions or advice , it will be greatfully recieved. Thanks P.
The only type available from continental are 42mm and these are too short for 88mm section rims .
Anyone got any other suggestions or advice , it will be greatfully recieved. Thanks P.
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