I think I used particle board or MDF when I was repairing the grills on one of my pairs of 19s. If you have the original grilles to use as a template it's easiest to just copy them instead of trying to reinvent the wheel. Whatever material you use remember to spray paint them black if you're going to use black fabric for the walnut cabinets. Or try and color match the brown fabric the best you can if you're using brown fabric for the oak cabinets. You don't want to see the frames through the fabric.
Here is a link to the original fasteners Altec used if you're missing some.
ROUND DUAL LOCK FASTENERS - 3/16 HOLE - DLCparts.com - DLC Parts -
Good luck on your project. The Altec 19 are awesome.
Tim
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