Any golf mk4 tip will fit, i think one has an extra port you just blank off. I've had the mk4 TIP before and wouldnt reccomend one to anyone due to the fact Forge make a far superior item. You have to trim the mk4 tip on the turbo end and then it doesnt fit that well.
Samco/Silflex is in Talbot Green no where near Caerphilly btw.