Yes….those are air cap bolts where the air lines connect to.

On my 1998 Ultra…..the air lines would pop off, then spewing oil along the fuel tank as I rode.

Ended up capping them off using regular bolts instead.

Not your issue….just FYI

 

Here's a link to the PDF for the service manual:
https://www.carlsalter.com/download.asp?p=1634

Make sure and click the "Download" link after the "I'm not a Robot" captcha, not the "Continue" button at the top of the page.