Grow Tent Height Extension kits

Has anyone dealt with grow tent extension kits? I am looking for a 4x4 grow tent. Most of those have a Max height of 7 feet. I have seen some extension kits with a 1' to 3' height extender, but it's Gorilla Grow and very expensive to purchase. Does anyone know of another brand? I would like to grow a 7' plant indoors and looking for ideas on how to achieve that?

Appreciate your help

For starters, if you want to grow a 7 foot tall plant do you plan to use side lighting so the bottom 5 feet of the plant can make good bud? Will the side lighting have space in a 4 x 4 area? Or did you just intend to prune the lower 5 feet off? I am just asking as to why the motivation to grow such a tall plant in a 4x4 tent. Thats a lot of veg time. Is the goal just to make one really huge cola for shits and giggles? I can get that. I am just confused a little.

Sorry, I don't know much about the extension question.

Few days ago, i was searching the same topic and found a blog where have list of best grow tent kits for all size of grow tent. I Think if you follow the blog, you will get high quality kits for your 4x4 grow tent. They discussed all kind of kits like fan, carbon filter, Complete ventilation kits, light, dehumidifer/humidifier and much more. Here is the link i recommend to follow.
Link: https://mygardenings.com/complete-grow-tent-packages/

If it's high yield you're looking for there's other ways to achieve that rather than growing a ridiculously tall plant indoors. Try topping the hell out of it and scrog that shiznit.

Only ones I have seen have been gorilla brand.
I think the work involved to modify a tent would be a pain in the ass.

Probably easier and cheaper to just construct a basic wood frame floor to ceiling and cover it with panda film or something.