Hello. Here is a link to the "GY6" exhaust gasket. It fits avenger 85 with a little trim along top for heatsink. Perfect bolt hole spacing.
27mm opening (bigger than stock pipe, smaller than port). Be aware, there are smaller diameter available and 27mm was the largest I could find.
Hope this helps.
![20240131_121829_HDR.jpg 20240131_121829_HDR.jpg](https://motorbicycling.com/data/attachments/104/104702-85bff1a632079b24257f636749553442.jpg)
27mm opening (bigger than stock pipe, smaller than port). Be aware, there are smaller diameter available and 27mm was the largest I could find.
Hope this helps.
![20240201_093721_HDR.jpg 20240201_093721_HDR.jpg](https://motorbicycling.com/data/attachments/104/104699-59f04f043c48431847bb936d5c8ce880.jpg)
![20240201_094907_HDR.jpg 20240201_094907_HDR.jpg](https://motorbicycling.com/data/attachments/104/104700-56f3fdbfd9456ca39ae5428b2aa28595.jpg)
![20240201_104522_HDR.jpg 20240201_104522_HDR.jpg](https://motorbicycling.com/data/attachments/104/104701-1f3cb747190dac786b7e273895381bf4.jpg)
![20240131_121829_HDR.jpg 20240131_121829_HDR.jpg](https://motorbicycling.com/data/attachments/104/104702-85bff1a632079b24257f636749553442.jpg)