Brake booster adapter plate

I am converting my 1988 Vanden Plas from the Ghirling Hydraulic Brake Booster System that uses Mineral Oil to a conventional system. I have ordered a Brake Booster (Part# CAC1227X, fits '79-'87 XJ6) from EnglishParts.com. I need the plate to mount the booster to the pedal box. Is there a plate that I could purchase? If not, does anyone know the exact measurements for the plate, including where the holes should be drilled?
Thanks.

Hope this helps …

unnamed

plate

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Immensely. Thanks Grooveman.