Correct thats what i bought although i just went direct to Jetex.
Yes they just slip in, stole the idea from the exhaust bung i used to use on my Evo and combined that with my bike silencer so basically a silenced bung
Heres a pic i've just taken to show the underside, once it's in position I use the clamp to keep it in place.
Hope this helps?
Gimmie a shout if there's anything I can help with