L, not to dampen your enthusiasm or limit your options, but I don't recall
posts that describe E53 wheels going on E70 hubs with exacto fito...

Maybe someone has, reported it and I missed/forgot it.

I do recall the hub bore size supposedly being diff.

An old info post of mine:

"From my quickly fading memory, hub bore size is
slightly larger on E70 wheels vs. E53:
reportedly 74.1 on E70 and 72.56 on E53.

I think an E53 wheel that one likes, could be machined
easily, to fit well on an E70. I suspect the reverse is
not practical, unless one found a good welder and grinding
man at that machine shop."

What I'm saying is before you run down to PepBoys to have
your E53 winter wheel/tar set slapped on, you might do some
"checking" at a real/good quality wheel/tire joint.

And, any real world experience from the E70 gang will help all
of those that have E53 winter wheel sets hanging around.
Back to peruse...
GL,mD