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Could i use those fantasy style bases in a competition if i wanted to?

Or do i have to shell out the dough for those rounded ones?

Don't think anyone would give you a hard time over it. The biker bases look a lot better and actually fit the models though.

You mount them on whatever base was supplied with the model. It's that easy.

The old bikes came with the rectangular bases so either one should be fine. Even TFG wont be able to tell which edition the bikes were produced for.

I think only TFG would care as long as it makes sense on the model. No dreadnought bases. Otherwise I think you're fine.