Discovery 1 wheels and offset

I'm looking at putting a different set of rims and wheels on my discovery 1. I've looked and can't find any definitive information on this so here's my questions

Will a 245/70 r16 tyre fit without rubbing ?

Will I get away with using a 6.5j r16 et20 (wolf rim) rather than the origonal et33?

Or have you got any other tyre and rim combo that Will fit under a standard discovery. Cant lift it or put arches on it.

Thanks