Hey Ermin,
I had the same problem here in New Zealand but found the Roxul products.
They seam to be similar to the Owens Products. (Check out the Data Sheets to see the ratings as your products there are slightly different to in NZ).
Something like the Industrial Slab 590 should be great or possibly one of the Multi Purpose Slabs.
You have a company there called AIS Group that should be able to help you out.
AIS - Australasian Insulation Supplies Pty Ltd
All the best,
Paul