The only PT Glass that I know is the guy who makes the glass vapcap. Haven't seen the j-hooks. If you are in the US, Oregon Glass Blower does excellent work. Everything is built on demand so you can get good custom work that way:
Good Vibes Boro makes great hooks too, but they mostly have boro balls for cooling rather than dimples for cooling. You could always check if he has customs open.
Although the simple hook you describes sounds a lot like what TRWW makes:
Modded 14mm Borosilicate glass J Hook. These J Hooks are very well made and sturdy. They work great with any 14mm adapter or bowl
theroguewaxworks.com
Although you mentioned "dimples to make it stand", so it might be more complicated than I pictured.