...and in what time period ?

I lived in Granada Hills in the late '60s, a few miles away, and was running all over the SFV at the time.
I haunted the Dodge & Plymouth dealers in Reseda often, cruised Van Nuys Blvd religiously, etc.
The '67 GTX that still sticks out in my memory was a black/black 4-speed car, owned by a guy who worked at Dale's Market on Devonshire.
He kept that car immaculate, and I was hoping to buy it, but then the '68s came out...

I don't recall a red one, though I later had a yellow/black VT/black one, 440/727.