According to this thread:

http://tvwbb.infopop.cc/eve/ubb.x/a/...2/m/2990088733

Weber's Kettle wire grate #91425 for the cast iron griddle has an opening
that will hold a cast iron grate.


"Usswl" m> wrote in message
...
> Not an expert grillmaster, but a fairly good cook. I do love grilling
> and do it pretty much year-round. My question is fairly simple and have
> not come upon a solution yet.
>
> I have a Weber Silver Kettle (the one with nickel plated grate). I love
> grill marks and have been looking for a cast iron grate that someone has
> got to be manufacturing.
>
> I came across one website that mentions a round cast iron grate that
> apparently Weber doesn't manufacture anymore.
>
> Furthermore, from reading one or two articles on this newsgroup, some
> folks have said that cast iron grates are high maintenance.
>
> What other solutions can you recommend (apart from getting a new grill).
>
> I like Charcoal, I like my weber kettle, but I do wish I had a heavier
> grill (with hinges, preferably). Oh and I'm cheap-ish, so if costs as
> much as the grill, I probably won't get it.
>
> Ideas folks?
>
> Thanks
>
> Uss