Black plastic light bulb holders for instrument panel?

Is there a source for new black plastic light bulb holders, for the instrument panel bulbs?

When I assembled the new dash for my 1973 Duster, I was short a few holders that had both locking tabs intact. I could use about 4-6 more, then I can go pay $7 for a pair of #194 bulbs at Advance Auto Parts or maybe cheaper online.