Well guys. I have looked back again at both the TC-193 paper version as well as the on line parts look-up and I can NOT find the dipsticks you picture.
The Cast Iron rears had the "filler hole" in the rear cover and was used until serial number 719,999. Starting at S/N: 720,000 & higher they used the dipstick as I previously posted.
So, I am wondering, if these dipstick you picture are a PO Mod. I would think if it was standard production, it would appear in the Parts Manual.
I am still waiting for the Original Poster to post a picture.