I seriously doubt they have an HT version to fit our cars. The HT plugs are not like any others. The threads are in the middle of the plug, not the end like conventional plugs. They are also much smaller in diameter than typical plugs. You need a 9/16" spark plug socket to get them off. Try finding that. I had to use a regular tall 9/16" socket.
On top of that try finding the colder HT0 plug. I've been trying to get some for weeks but they are backordered everywhere.
Take a stocker out and just feel it! There is this thin spring inside that cannot be a very good conductor, and how do they expect it to attach and stay attached to the plug?. Also that thin flimsy cover can not be protecting the whole 'system' very well... sparks going everywhere but where you want/need them!??!
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