That looks like the correct part number for the blanket. Replacing the insulation isn't to difficult, but you will need to remove the burner box base located under the cook top to get to it. There should be a couple screws per side going into the top of the side panels. Once removed, the insulation can be removed. There may be some wire holding it in place along with it being stuck to the cavity sides. As Denman suggested above, you may want to identify how far the urine has migrated and cut out that section. Then replace it with part of the new blanket and put it all back together. If it has caused lots of damage, removing the side panels would be the best bet to get to the rest of the insulation. Just be aware once you remove the panels, there isn't going to be much holding that thing together so pay attention to how it comes apart and a helping had or two would be very helpful.

thanks alot guys. you have been extremely helpful.