62 c10 - which drop spindles?

[53lowdown]

I have a 62 c10 that has disc brakes installed by previous owner. It has stock torsion bars suspension, and stock height spindles. I need to replace ball joints and I'm considering installing dropped spindles at the same time.

Question is: which spindles do I currently have? That way I'll know which drop spindles to buy that will allow me to reuse my current disc brakes and hubs.

My current spindles are marked with 7525 (or maybe 97525?), 43A, and A46 Can someone ID these? Pic is attached.