What company makes the hardest rear buggy foam insert? What is the part number?

I'm looking for something harder than the Proline Impact Ulta-Firm Grey Foam for 2.2 buggy tires, Part number 6186-00.

Thanks

maybe try to make ur own

I think I may have to do that.

it dont sound that hard

mabe trinity makes one like the bomb 1 truck insert, it is light blue and very firm.

or u could try those