Yeah. you must have had it confused with something else. His process is 100% bolt in and it is reversible. In fact, you don't even have to cut anything off like you do on the others.
Just for the record, depending on your car, you may not have too on the GTS either.
It's truly amazing just how much variance there is under these cars. I had to cut my bump stops off. However, before doing so, my buddy down the road has a 74 duster, his bump stumps are located almost .5 inches farther forward on the frame than mine were. I don't know why, his is unrestored, not wrecked. So with his being farther forward, he probably could have gotten by withoutcutting his off if he ever installed a GTS. As mine just barely wouldn't clear.