I need to ask a few questions to be sure I give you a correct answer, as I'm not positive what you currently have. I'll make some guesses below, but I need to hear exactly what you already have.
You mention you have an Evo (which I'm glad to hear you love), so I assume you have a battery handle that takes two RCR123A batteries.
It is possible you have a LV (low voltage) Evo core, but that's not likely. If you do, your handle will only take a single battery.
If this is the case (you have a two battery "SV" handle powering your Evo core), then you have two choices for the concentrate (DART/Revolution) core .
(1) You can see if TET has any SV DART or SV Revo cores around, and order one of those (
not what your first link points to). Or you can ask TET if they will rewind a LV core, turning it into a new SV core (re-coring costs an additional $10 or $15, as I recall).
(2) You can order the LV DART core your first link points to, and also order a different battery to use with the LV core in your current handle. You will also have to order a different charger for the new battery.
If you actually do have a LV Evo core, along with a single battery handle, then all you have to order is the LV DART core your first link points to.
As far as the second link to the TET Tool, I have one, I love it, I rarely use it; I think I paid way more for it than the current price.
As far as the third link, unless you have a T1, and no Evo/DART adapter, this makes no sense.