Here's a couple of pics that might help. The instructions on the NOS 3974251 oil pan that I have calls for the service 3951576 stick, but my original "flattened" '69 stick is different, marked like all the previous threads, and looks different from both the 3876869 stick and 3896912 sticks shown on the attachment. Note the date on the instruction page - 2/69, and the reference to the 3951576.
BTW, all three of these sticks are identical in length, regardless of handle. The only thing I have not checked is the position of the markings relative to the end of the stick -
If you need any detailed pics, let me know. I just posted pics of the pan itself on a separate posting concerning '68 pan number and appearance -