This one from Brasseur looks pretty similar and has "PA" in the description.
> K2410-X002 Drive Gear Worm Wheel Shaft and Bearings Assy RS Pa Etc
I don't see where the wheels fit onto that axle though? Doesn't seem wide enough. But for $7.50 it might be worth a shot
That's the internal drive gear, it's not the axle.