Max, thanks for the offer.

I called around and my local NAPA had them in stock.
Their line is "CEP" and part number 219-3054 for the 19/32" plug. I stopped over during my lunch break and bought a few ($0.29 each) for my drawer/future use.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1