Could anyone tell me if the 4.9L, 5.0L and 5.8L all share the same alternator mounts?

I know for sure the 5.0L and the 5.8L alternators are the same but I'm wondering if they would also work on the 4.9L, looking at my stock alternator it's got a few extra mounting holes that I don't use but I'm wondering if they are there for the V-8 engines.