Thanks again :)

It required no modifications, just some patience. Took me a tire to find out a technique that works but then you gotta make sure the foam is balanced. I can try to explain it...

What you do is insert the foams into the tires, then you take one side of the tire and pull it outwards so the side of the tire is wider. Then you slip that side over the rim and keep pushing and being careful not to mess up the foam. It takes a toll on your fingers ;)