Howard,
I cannot answer with any satisfaction. There is no "T" variant of the Moog parts, but it is entirely possible that Moog has changed these parts to the "M2 technology", but the catalog does not distinguish--it is now old, and would not contain that kind of detail anyway, I don't believe. A call to Moog/FM tech would be in order to get the answer you seek: 800 325 8886.
As for the GM/ACD parts, they are sourced from Dana/Spicer/Perfect Circle, I'm pretty certain. I'm not certain how far they have taken the upgrades, but the parts I've looked at so far all have blue poly grease boots, but I don't know the story on the internal design. Reference is made in ACD catalog to "toll-free tech support", but I don't know if that is 1-800-ACDelco, or what. There is also online access at
www.ACDelco.com/TechConnect but you may have to register on the site first to use it. I believe the ACD suspension line, based on the Dana/Spicer/Perfect Circle "Professional Grade" line, is something different than the Moog "standard" design.
May be that Glenn Miklos in Norfolk can help.
In the meantime, these links give some indication of the design of the parts that are now being offered by GM thru ACDelco--at least there is some significant similarity in the parts I've seen so far.
http://www.spicerchassis.com/
http://www.spicerchassis.com/crosssections.htm
I have no reason to buy these particular parts, so I can only suggest that someone who is looking to replace their HA sway bar links look into this further. Perhaps Dal would bring in the parts and bring them to St Louis for a look-see. These particular parts aren't that expensive, but those who are using the parts should seek the answer to the rest of your questions.