02 sensor removal help

ok well i got it out... kinda lol... the o2 sensor on these threads into an insert which threads into the manifold...

so it unthreaded the whole thing with the insert and sensor still locked...

so i proceeded to heat and dunk the thing a couple of times... put the insert in the vise and welded a bar to the o2... and got them apart...

bummer of course is the threads for the o2 are now jacked up in the insert... lol...:oops::banghead::banghead:

so now i need to get a new insert... but they seem to not exist in any parts store...

so any idea's on going from about a 22mm in the manifold to 18 on the sensor??