One thing I found interesting is that seat belts are not supposed to be more than 3 years old. U/V light deteriorates the nylon. I bought my car used, and the belts were dated 1988, yes 13 years old. After I bought a replacement set I did find out you can have your seat belts re-webbed and save some $$$.
I also have the non-cam lock style and it's a snap
to latch.