Got a response:
"Habenero peppers will work but we use Scotch Bonnets for their intense fruity aroma. I wouldn't know how many peppers in a 5 gallon batch but I can tell you we use roughly 8-10 pound for 500 gallons. Peppers are different every time I use them so the best way to make that decision would be to take a bite and see how spicy they are. There is no science behind this process, I'm a chili head and a major fan of all things spicy so I developed a feel for the pepper I'm using.
Rough chop the peppers ( seeds and all ) and dry hop your finished beer. Do not add to the boil or you will get an unpleasant vegetable aroma.
Once dry hopped wait a few days and taste, when your desired spice level has been achieved rack the beer off your peppers."
Looks like this would equate roughly to 1.5 oz for a 5 gallon batch. Honestly I am pretty bad at drawing conclusions from unfinished, uncarbed beers which is why I am hesitant. If my memory serves correct, this was not a very spicy beer which is why I liked it and why I was thinking habs since there heat level is similar to scotch b's. Looks like scotch bonnet would be the way to go if I want to get something similar.
Thanks for the responses. At least I know how I should do it...