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Grant,
Andy's link is the right place to go for the foam. I have found them to have the best prices.
Yes, you cut the foam to shape to fit your tank dimensions. I would make the foam blocks the shape of the tank from a side view if possible.
Then you just stuff in the foam piece by piece until you have the tank full. It would be easiest to make a access port in the top center of the tank for insertion of the foam. This is then just covered witha plate. JAZ will have these cover plates as well.
You will only lose about 5% of your fuel capacity with this. But it will stop the fuel sloshing problem.
We used this method in Formula fords years ago, when the rules would not allow a fuel cell due to cost considerations.
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