E70 wheel dilemma. Not sure what to get.

[Serf27]

Hey everyone, my e70 has 2 pretty beat up wheels on the driver side, looking for some insight on what to do. Just looking for opinions and other minds to chime in.

It currently has style 599 replicas. 20”. 315 in the rear and 275 up front.
I found the individual replicas a few months ago for about $550.
Now they’re not available, at least that’s what the site says, I have to actually call the warehouse.
I also need 1 rear replacement tire. The 599 looks nice but almost too small, and the front 275 has some stretch on it.

A friend gave me 3 new pirellis, 2 315/40/21 for the rear and 1 275/45/21 for the front.
I stuck the tires in the wheel well and they did fit, but they might not fit once actually mounted.

I need 1 tire regardless of what size I go with. A 315/35/20 for the 20” set or a 275/45/21 for the 21” set.
The 20” set needs 2 replacement wheels(+1 tire) and the 21” set would need a whole new wheel set(+1 tire)

The + side of the 21” tires is that they are not run flats like the 20”. The downside is having to buy a new wheel set, and running the chance that the tires I have will be too big and not fit.
The + side of waiting for the 599 replicas is they would be cheaper. The downside is their smaller size and the Run flat tires.

The dilemma, wait for the replica 599s or get a new set of 21”?