2.75 elbow to down pipe gasket ?

i saw online about it being 2.75in / 70 mm but i can only find 3in/ 80mm or 2 1/2 wtf! its driving me crazy its a sr20det where can i find that gasket..

also what tranny fluid should i run and how many i was thinking . royal purple but which one syncro mesh ? or regular 75-90 need help been with out a car for week need it running .. reason for changing tranny fluid i think its low .. its whinning under load..
 
I use Mobil 1 tranny fluid.

If you can't find the gasket, make it. Advance sells rolls of gasket material that work for most of anything.
 
You don't even need a gasket there...I don't run one. You can probably get one through phase2motortrend or similar "sr specialist".
 
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