Mk3 has two set up's ,Bosch and ducellier, the two caps are different , but by comparing yours to the photo you can work that out
By the sounds of it you have the bosch set up when looking on euro hit the specification tab an it states what system each part fits , the dizzy cap clips on with two sprung arms and the body is black the bits where the leads go on are brown is Bosch ducellier dizzy is all one piece and all black . The rotor arm just pulls off and can only go in one position .
The leads are no different if I remember correctly , one set is cheaper and I got them as I'm tight

, only issue I found was they were all the same length leads causing closest plugs having excess lead ,
All great quality and I have no complaints .
And don't forget our forum discount