I´ve always struggled appropriate (good looking) tank caps for my custom builds. Most of these are that ugly I´d rather leave the original caps than spending money on somethings that not worked out great.
Thankfuly there´s people out there with both, design and machining skills.
Available from @thepowerbrick in different colour options this is the perfect addition for your bike. CNC made in highest quality! Available here: https://powerbrick-parts.com/
Get your here: https://powerbrick-parts.com/