Rotax 912 oil tank

Look up the parts manual for that vintage engine. It will show an exploded view of the internals.

An internet search has not produced a 1995 issue parts list for a Rotax 912.

Is there archive resource for legacy documents?

Here is the Oil Tank page from the 1995 912 IPC...

(disclaimer: HISTORICAL DOCUMENTS  - FOR EDUCATIONAL PURPOSES ONLY ( Information May Be Outdated) )

** NOTE: we don't publish an archive of older versions of documentation for engines still in production - to prevent confusion, only the current versions are available online.

After an engine is finally out of production, we can then put outdated reference information 'FOR EDUCATIONAL PURPOSES ONLY' in our 'Historical Documents' areas ( example : https://www.rotax-owner.com/en/support-topmenu/engine-manuals#2-stroke-historical-documents )