alternate tyres?

Hey Guys, anyone got and idea if there are alternative tyres to the standard goodyear eagle since i am having trouble getting my hands on some and have just noticed a chunk missing from my right rear tyre.

Also anyone know what the best track tryres are for the car?

thanks guys.

also check out these bad boy tyres below. unfortunately they dont have our size yet but i know i will be waiting for them .

http://www.automobilemag.com/multimedia/photo_gallery/0510_pontiac_gto/