OK
I'll start with some measurements of my older non collared insert. overall length is 44 3/4", OD of the tube is 2 1/4". Its 9 11/16" from the end of the ears to the center of the first hole ( see pic ). So if the newer (factory) collared insert have these same measurements than I would think that it'll work with possible trimming down outer tube like Doghead suggested to make up for collar length so the first hole aligns.
I'll start with some measurements of my older non collared insert. overall length is 44 3/4", OD of the tube is 2 1/4". Its 9 11/16" from the end of the ears to the center of the first hole ( see pic ). So if the newer (factory) collared insert have these same measurements than I would think that it'll work with possible trimming down outer tube like Doghead suggested to make up for collar length so the first hole aligns.