Actually the collar is not part of the shift knob, but there is a cutout on the shift knob so you can pull up on the collar in order to shift into reverse. I am assuming your GT is automatic so you wouldn't have this collar. Here is an example of the knob although it is for a accent. http://www.ebay.com/itm/Hyundai-ACCE...-/120943845936
Yeah, the wife didn't want a manual transmission with a baby on the way. But the shifttronic makes it a little more livable for me when I drive it.
I haven't come across that style before, previous cars I have had with a 6spd were the push down style for reverse. If I see anything I'll let you know though.