I was first leaning towards the impact archery,the air lite,and trio site is based on the same clear housing,but the slider looks more like the Cobra easy slide system.
But,the truglo gets my vote as well.I am also sure they were the first ones out with the clear housings.
I have never understood the 3 pin on a slider unless you are looking for long range shooting past say 60-70 yards.
Try going to
www.archeryhistory.com you might find what your looking for.