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According to Sandy, according to the 1994 Alps catalogue, the SKFR/SKFS series comprises the following:

Part Series Slider Type Description
SKFRAC SKFR Black Linear
SKFRAD SKFR Yellow Linear Short depth
SKFRFA SKFR Black Linear Red LED
SKFRFB SKFR Black Linear Green LED
SKFRFC SKFR Black Linear Amber LED
SKFSAA SKFS White Tactile

Two approaches to LEDs were taken. SKFRAD has a short front-to-back depth and leaves room for an external LED, while SKFRFA–C support an internal LED. A switch matching the description of any of SKFRFA–C has yet to be seen in the wild.

SKFSAA is a tactile switch, although the design produces a subtle click.

View full-size image SKFRAC
View full-size image SKFRAD
View full-size image SKFSAA