Quote Originally Posted by Innuendo View Post
That would be about the time of the dreaded UC styling infection.
HZ commercials ran into early 1980. I reckon by 1978 the fad for surfie vans was dead. Plus the extra bold stripes probably had become a bit tacky.

I also think the round headlights were starting to date the cars badly. All the modern cars were using rectangular shaped lights. Probably why the WB remained popular long after HQ-HZ had become rather uncool.