Should look similar to this........
Need them for a 4.8 99' GMC

 

I've go some for sale if your interested. they are indentical to the one's in your pic. I had them on my 99 5.3L truck and they worked great. I took them off because my custom tune had my rear o2 sensors turned off so I no longer have a use for them. Here's a link to them, and includes pics too! just let me know if you want them.

https://www.performancetrucks.net/fo...d.php?t=353345

 

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