Autolite 3925 discontinued?

[387lx]

I’m looking for stock heat-range spark plugs for my 351W with Performer RPM heads. I used to run the 3925s (heat range 25), but I can’t seem to find them anywhere. I can still find the 3924s, but my tuner suggested sticking with a stock heat-range plug for now.

Do you know if the 3925s have been discontinued? If so, is there a replacement part number or any equivalent plugs with the same heat range and fitment?

Thanks!

 

[Mustang5L5]

Did the plug ever exist?

I was curious, so i did some searching and see posts back to 2005 with folks saying they can't find a "mythical autolite 3925".

https://www.corral.net/threads/spark-plug-mysteries-plug-chart-for-autolites.173648/