The soft dash RRC also had the 90 degree bracket on the back of the seat runner, though in theh RRC the holes to mount the ealrier seat are still there. It's so you can fit/remove the seat without running it forewards and back 2 or 3 times. The later softie seast are themselves a bit softer, you sit in them not on them. The softie is sometimes called the 300 series RRC.