My dad and I are working through his 66 Valiant that he recently picked up. Our focus has been on getting the fuel system all straight and getting it running. However, a notable problem is the doors on the drivers side won't latch. On the rear door, this toothed gear (see pictures) on the latch just free spins, but I am pretty sure it is supposed to click without fully rotating. On the drivers door, the same gear does not properly latch. Any ideas what I should be looking for inside the door that might be the problem once I pop the door panels off? Unfortunately, I can find the latch receivers as replacements, but this part is not reproduced, that I can find. Otherwise I would just buy new latches. Any advice would be appreciated.