Reporting question for Knob - Ampeg, Classic, D Shaft

Knob - Ampeg, Classic, D Shaft

Will this properly fit the Transformer Balance knob on the rear panel of an Ampeg SVT 3 Pro? It is a D shaft pot which is slightly smaller than the midrange selector knob on the front panel. Nobody makes a replacement knob for the rear pot! Yet, in the manual and pics online, you can see the rear knob looks just like the metal knobs on the front.

This will work with a D-shaft pot and the interior diameters are: Diameter 0.25 in. Width 0.16 in. I would compare these specs with your amp.