Thanks everyone. I just realized that I have a bigger problem. The right side chain adjuster is rubbing against the wheel. Moving this over to technical help forum, where I guess it belongs.
I know it's a bit pricy but Triumph makes some great looking saddle bags for their bikes. I have never been thrilled with after-market accessories. Suggest you look into OEM saddle bags. Below are the Triumph OEM bags on my bike for reference. Anyway you have a great looking bike. I wish the Street Twin came in British racing green !!
Welcome here, I see you've had a lot of help already. Always nice, and in the meantime I'm learning also