Universal cases have that opening too. What is the code on the 1976 case your attempting to use, sounds like a fuelie case ?
Check the SAMBA for lots of case interchange information.
So your asking if your puma tin will fit ?
I have a single-plunger case with no dipstick tube but a type-3 style opening on the case where a Type 3 oil filler would go. I think I know now that there is a special Puma dipstick tube that attaches here, but the customer has decided to use an adapter tube and stock dipstick for this application. Thanks for the help!