Speedometer block off plug for an early A727?

Hello and greetings Moparphiles. Need some assistance on this matter.

As the title says, I'm looking for a speedometer block off plug, (speedo gauge is busted)

And since I'm almost done with rebuilding an pushbutton A727, I figured I can get those plugs that fit into the tail case speedo port in the meantime.

The speedo port size in the tailcase measures out to 0.9645 inch.

I'd rather not resort to plugging the port with a core plug with RTV, or slathering RTV on the speedo gear...

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