Foam insert for meat grinders

[teambowen]

Hi guy and gals.
I'm looking to put a set of meat grinders on some new rims.
i've ordered some hobao st rims but need some advise on what foams to put in them as i can't find any of the shelf.
I've been told that you can use buggy foams in them as the side wall is quite thick.
Any advise would be appreciated with this.

Sorry, the tyres are for a truggy of course.