So far this is all I know:
Markings on front brakes: GMN L-48
Rear: 1070204 (then there's either a 1 or a /... he's not sure)
Single piston - no rear axle... rotors, calipers, backing plates
What say you?
Not them. JL8's were four piston and the disc's were larger than the optional front disc's.
Before I read Dennis's link, let me tell you a story.

When I sat in the sales office of my dealer ordering my car back in 1969, I asked the TWO salesmen 'How much for the 4 wheel disc breaks?' They looked at each other, shrugged and left the room to find out. Ten minutes later they returned with a torn-off adding machine tape and handed it to me. Hand written was the number $512.00. That was more than my L78 or CX Turbo 400. Hell, it was more than any of my options and my sticker was over $5100.00. In fact, it was two months pay for me. Still, I wanted them! There was no such thing as calculators or PC's. Nothing to help me to make a decision. I must have sat there thinking of a way to pull it off for over 10 minutes. Nope I thought. All my buddies said the regular disc brake option was good enough. Well, over the years the JL8 proved troublesome and my regular disc brakes are still perfect with the original rotors and calipers. They work really good too.:thumbsup:
But. About 25 years ago Hotrod Magazine did a story on the first gen's that was mainly about the 69. It called the JL8 option the #1 Camaro option of ALL time. Only 112 were produced (as I recall the story saying) and most of those were on now wrecked race-cars.
Hind sight:sad: .
Now off to Dennis's link after I pour a cocktail.:hurray: