Yeah, all they do is give you what...
Pro-kit includes O2 extension, upgraded flange gasket, O2 bung plug, and matched piping for better sealing.
they might have most of it covered...but I don't think they do.

You're going to need better clamps. Get yourself some slip joint clamps, also called step clamps from NAPA. Get a couple long stainless bolts/nut/lockwashers from a hardware store, and you should be good.