ht leads

i am putting a 16v engine into my rover 100, and I'm using speeduino. the coil side of it I'm using a ford wasted spark unit. it has inside the little poles for the leads to clip onto. the rover plugleads are like a mini style on the end. so i bought some ends and fitted them to the leads. they are the silicone type. trying to start the car and i get no spark. ive changed the leads and i get a spark.

its all new stuff, so why dosnt the new ends transit the power? Is there something ive done wrong?

thanks