Look in the development section. The rooms you are looking for are marked with P7500 and or 3G.
Otherwise the roms for 7510 will most probably work as well but without 3G support. If you don't use 3G it doesn't matter anyway. But read carefully in the threads, it could be some rom that really don't work with 7500 and will brick your device. But i haven't heard about that.
Read in the threads it's all there.
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