Update. I looked at the upper oil pan on my 85 CA engine and it has only the single turbo oil drain stub. The casting has the hole for the air cleaner oil drain, but it wasn't machined thru. Since my replacement engine has that stub (and check valve), I may get a junkyard drain tube and cut it (for straigher shot). Seems smarter than running oil into the turbo inlet like the factory design.

Edit
I received the MR2 air filters and they fit great (photo). They should fit tight height-wise since slightly taller (~1/8") than the factory air filter. The only issue is that the inner sleeve inside the "trash can" blocks part of the filter at the bottom, but true for the factory filter as well (strange design). Again, this special air cleaner is only for 85 CA 300D's. Those owners can now stop whining about paying $45 for an air filter. I'll let someone else chime in about whether an SDL's air filter might fit (below).

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