WTB: Auto-Nikkor S 50mm f/1.4 AI

I'm looking for a chrome nose, fluted focus ring Nikkor S 50mm f/1.4 that has been AI converted.

I'd prefer one with a factory AI conversion ring, but will consider a "cut" one for the right price.

Perfect or near-perfect glass is mandatory, as is proper operation of the aperture, focus mechanism, and an undented filter ring. I'm fairly tolerant of non-functional cosmetic issues like paint wear on the barrel/focus ring or worn/discolored markings.

I would also consider a cosmetically rough lens with good glass that has not been converted, as I would not be bothered by doing a conversion myself on it.