On our 66 Suburban, it has the main drivers seat, and the flip up passenger jump seat. On the main drivers seat, on the left hand side you have the lever and ratchet stop to adjust the forward/rearward position of the seat. I have noticed that the right side slider for this seat does not have ratchet locking device on it, which would let the right side of the seat able to move front to back. I see holes where there may have been a locking device, but it does not appear to have had one. Did the drivers seat normally have a locking mechanism on the right side slider?

Thank you for your help.