10mm spark plug head probe...
http://www.aircraftspruce.com/catalo...es/1105561.php
Single cylinder gage...
http://www.aircraftspruce.com/catalo...s/westcht1.php
I've bought from the spruce guys before, and the CHT stuff is top quality.
But since they don't advertise here, no telling how long, or if these links will survive.