The number is:  4477

Are they worth it? At 4x the price of regular Bosch Platinums, you
figure it out.
I have bought a set and as of yet have not installed them The van is
running well, so why?

tim

> "David W. Long" wrote:
>
> There is no listing in Bosch catalogs for a +4 spark plug in a Vanagon
> application. Does anyone know if one will fit and how they compare
> with other plugs? Are they worth the extra money?
>
> David W. Long