The miracle of ebay, and quantities of scale due to this being a large issue, apparently.
Trouble in paradise, took it in for a sticker and they found my exhaust donut gasket
had failed (of all things, LOL). Seven bucks later and I had the appropriate part in and passed inspection. Someone's worked on this car before-- only one stud remained, the other two positions were taken up by 5/16" nuts and bolts. The brace down by the flexpipe is gone-- and, upon cursory examination, I can't even find any threaded holes to use for a homemade one. Without this brace this flange has its work cut out for it, and, perhaps, I may be doing this again in time.
Also my mail order transmission gasket was the wrong part, I wound up needing the "15 bolt" one that's shared with the 3-speed tranny found in Corollas and Prizms. Bizzarre. Skipped doing the filter once I read it was a rock-catcher. Second ATF change with DexMer done, new aluminum drain plug gasket in, magnets cleaned off, she's mint.
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