Welcome to the TA Forum.
Not sure if this is the better section to ask this question, but if it needs to be moved I am sure one of the Mods will come along and move it for ya.
I had read somewhere that Taurus will not sell the above parts to the public. Not sure if this is fact or fiction, but I could understand why they would not do so.
Not to mention that by the time you were to purchase all the needed conversion parts you could most likely buy a PT100 and then have two complete guns.