Exhaust insulators

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idlook2

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Dorman sells something similar for 90-96 topkick trucks. It's dorman part number 68597JD
I don't know if it's what your looking for but worth a shot

That looks pretty darn close. Just checked rockauto and it looks like part number has changed to 57009.
 

df2x4

4L60E Destroyer
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Thanks for taking a look! What website do you use to see diagrams with part numbers?

No problem! I used Nemiga Parts, The Chevrolet section. It's the only reliable site to look up any discontinued GM part numbers that I've found. Big thanks to @east302 for sharing that one.

https://nemigaparts.com/cat_spares/epc/chevrolet/

For parts that are still in production I like to use Wholesale GM Parts Online and sometimes GM Parts Direct.

https://www.wholesalegmpartsonline.com/

https://www.gmpartsdirect.com/
 

Steven Petersen

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I bought one off of eBay last year. My 88 had a Midas hack job and I returned it to OEM, hangers and all. I have the factory parts manual for 88-89 and I get the parts numbers from there.
 
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