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I Need part number for Compressor Output O-Ring

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I need complete wiring harness front to back pretty please?

auto transmission

I would try a large auto parts store, they should have a large assortment, they can try and match it.
 
We need more info to help you. What truck is it for?

If you’ll click on your user name at the top right then click on “Signature” you can put your truck info there and it will show up when you make a post.
 
Assuming you have the first gen IC elbow part # 3918800, then the o-ring part # is
3919852.

It will be orange/yellow, square cut silicone, doesn't deteriorate like rubber, and will not blow out if the elbow/IC pipe junction is squared up when loose & the clamp is then torqued to spec.
 
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