Yes....some places, they say the RE bar end mirrors fit the GT 650
Others say they fit both the GT650 and the INT650.
My recommendation is get the Kemimoto mirrors...round...clear lens...and just file a flat into the mounting gizmo...the gizmo on the mirror, not the gizmo inside the bars....
Really it is an easy job....those mirrors are top quality at a reasonable price and function perfectly...
Unfortunately it looks like the supply of these has dried up due to Corona....good luck finding them in stock...
Kemimoto says 15 to 45 days until shipment!!!!
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A word of caution, the Interceptor bar end components are different to the GT650. The GT650 has an insert in the bar that is part an parcel of the bar end finisher (shiny bit on the end of your bar) with a extended smaller diameter area where the RE bar end mirrors can be fitted. The Interceptor 650 is quite different to this.