There are no early style metal CAR stocks available, only std. fiberlite, current production aluminum, & M-4 style stocks.
We have less than 6 Colt 16" A-1 barrels left. A kit with either an A-2 or flattop upper (std. small pin, so you'd need an offset pin) would run $614.95 ($434.95 + $180 upgrade for the Colt A-1 barrel), add $40 to upgrade to the aluminum CAR stock. That would include everything except the stripped lower receiver.