Guess I spoke too soon.
When I asked Peavey about the part they said they don't have the original but they have a replacement with "different pointers", which I assumed just meant they were shaped different, a different style, different color, etc. It never occurred to me that they'd be opposite
I ordered the knobs and the arrow is pointing the opposite direction. The shaft is a "D-shape" so it only goes on one way.
In the attached picture, the PRE GAIN pot has the new knob, and the rest are the old knobs. I have all them set to 5, and as you can see pre gain is somewhere south of 0.
Guess I'll need to keep searching.