One talented owner fabricated a big triangular panel that covered the whole lower front portion of the door panel, upholstered in the same leatherette as original. Coves the hole, nice style and if you still wanted speakers in there, tiny punch holes in a subtle pattern could be added to let sound from the speakers pass thru. Being 6'2" w/long legs, I always kicked off that speaker grille when entering/exiting our car until I flush mounted the grilles.
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