Nope, I just slept at a Holiday Inn Express last night...and I remember wanting to kill that little bastard Bobby for punching that umbrella through the convertible top when I saw that episode back in 1972.
Oh, and as I suspected that Brady Cuda link is just showing stock photos of a 71 Cuda (the blue hemicuda ragtop) instead of the real car. Look at the alleged photo of the 69 Plymouth Fury Convertible - it has rusty fender skirts and modern radial tires - obviously they just grabbed whatever photo they could find.