This 4 speed tunnel was cut out of an Early A body and recently sold, see thread with pictures below.
No measurements, but maybe you can get an idea from the pics, or contact the buyer, Moparlvr166, maybe he can tell you if he had to trim this or not.
Good luck
https://www.forabodiesonly.com/mopar/threadsearly-a-body-4-speed-tunnel-cutout.451561/
Joe
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