I had this! Probably in storage somewhere. This car makes a cameo appearance in The Boy Who Knew Too Much:
The CIA man nodded. “If you want to play junior spy, you might as well make yourself useful. There’s a yellow Citroën Deux Cheveaux back there that I’ve seen too many times for comfort. Keep an eye out for it.” He added, “A Deux Cheveaux looks like an old Volkswagen Beetle, except flatter.”