the gv softpack has a rod in it which can be removed. i don't think the mr. right does. that said, the stp packer you linked looks a lot like it was made from a mr. right, what's weird though is that he offers it in three sizes whereas the mr. right only comes in two sizes,,,,as far as i'm aware. i have tried to push a hole through a mr. right but broke damages the packer (the silicone tore), so i'm kinda curious about that one.