I can’t believe Lulzbot would not carry the correct one, but it must be true. Amazon has become my go to place for a lot of parts.
If he gets it from the amazon link if it is wrong for what ever reason (it shouldn’t be) he can return it.
The parts part of the website lacks a lot of information about what it actually is the part is for.
Most things are not compatible with other things.
The ones at IT Works already have wires on them though. But if they really want to add their own wires that is cool. 
So I guess it’s safe to call this one closed…
In case it was missed by someone, this is the one that works and pre-wired even…
http://i-t-w.com/parts/thermistor-for-hexagon-100k-epcos
For less than $5 plus shipping its saves a lot of messing around.