Asbestos insulation in a kitchen range

I have a Home Comfort range that I am restoring, actually 2, as one is a doner. My problem is that it is the sheet metal skin with enamel in white. Between the outside and the inside there are sheets of asbestos insulation that has deterioratd a lot. some of the is actually exposed to flame particularly at the smoke exit at the top. I am wondering if there is a replacement material for this as of course one can't buy asbestos. The material would have to be in sheets about a quarter of an inch thick. Of course this is a nice feature as it contains the heat somewhat for use in the summer. If it wasn't raining so hard, I would take some pictures but maybe I can in the morning.

I know that in the steel mills we used a product called Kaowool but I'm not positive that it came in hard sheets.