I have put in bundles of those tubes both after market and directly from Chrysler Parts...I have yet to see one with threads on it....... those are press fit, there is no pressure at the tube opening and it is below the oil line , hence the need for a longer dip stick.....put a lil sealer on it ....I used non hardening permatex and gently tapped it in using a small block of wood.....no drips no runs no errors. The chrome one from Mancini looks sweet and fits like a glove
REMOVAL: begin to "wiggle" it back & forth & to & fro ( 360 motion) gently!! eventually it will get lose and you can pull it straight up without an issue.....
Removal of broken piece: Hopefully you have the cover off the engine? if so set it on a firm fixed surface...use a blunt edge punch and begin tapping on it again in a 360 manner tap move tap move tap move like that....remember GENTLE tapping in a circle....wont take long, maybe 10 mins or so and it should tap out....YOU DO NOT want to try to drive it out in 3 hits....that can **** it and it will take you a short lifetime to get it out PLUS you possibly ruin the cover in the process...... PATIENCE is a virtue and a necessity in this case.... for the more difficult ones I have used a propane torch and got the cover a lil bit warm...not glowing red just a lil warm and they almost pop out
my 2 cents