After combing the Internet, I have ordered the WSKS Aperture Fire Sight set from the Williams Gun Sight Company, Inc. The set features the Williams Fire Sights fiber optic front sight and a large hole aperture rear. The Williams catalog states the set requires no drilling or tapping and is fully adjustable for windage and elevation.
When they arrive, I will post a full review with photos.

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I recently bought the williams SKS Firesight/Rear peepsight combo. WOW! I followed the simple instructions (after reading the review – you will find it if you goole williams firesight sks). Simple to do, no weapon modification required. On the rear sight, make sure you keep the spring compressed and pushed back under the lip that retaines it when installing the replacement pin- it helps to have an extra set of hands! Sighting in the weapon is much easier,now all elevation-windage adjustments are made with the rear sight.