It looks like your e-bike came with the new larger 9mm Higo/Julet connectors.
As 
@harryS mentioned, that is new and rare, and chances are you won't be able to easily find a throttle with the larger connector on it, so you might have to make a connector?
You could cut the connector off your new replacement thumb throttle and solder a bigger 9mm Higo connector to it.
Meanwhile,.. I'll surf around AliExpress and see if they have a plug-in adapter.
Check out this thread too,..
My throttle works backwards on my first ebike.
	
	
		
			
				
			
			
				
				Does anyone know the pinout for the Das Kit switch throttle? Specifically, I know which pin is +5V, but I don't know which pin is signal and which pin is ground. I cant' find the diagram online.   I tried to switch to a Bafang half twist throttle, but it didn't work so I'm thinking Banfang...
				
					
						
							 
						
					
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