I have been cannibalizing all of my old clearos for modding parts. If you have ever rebuilt a (vivi nova, mt3 or whatever) coil you have seen the insulator that is very similar to what you are looking for in the base of the head you are rebuilding. My suggestion is to tear apart something you KNOW you are not going to need/use and see what useful parts you can salvage. Built my Ucan mechanical
mod almost completely out of salvaged bits and pieces.