i believe every GM car made in the 60's, and possibly earlier, that had a manual transmission, had safety switch under the dash hooked to the clutch pedal. i've seen cars as old aa a 66 chevelle that had it. but, it isn't a readily available replacement part.
if you have ever accidentally cranked the car over while the car is in gear(or had a kid do it), then you would want one.i want one for my nova that i put a 4 speed in, but no one makes them, and are always missing in cars in boneyards.they would be relatively cheap to make, and they could probably sell quite a few of them if they were to tool up and make it.hell, sell it with the clutch pedal kits that they sell.
1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16" IROC wheels