Yes MattR, I remember those Charger mags very well (loved the look) and I'm surprised they gave them such a short life. I never gave this wheel cracking issue a thought in the past.
I have been very wary of wheel cracks since these problems became more well publicised (thanks to forums) in the last decade. I have only run OEM wheels at track days and check them and the spare set with the road tyres very carefully after I swap and wash them (off the car) after each event. So that's around every few months. But I also hand wash and dry the wheels weekly when they are on the car, so another check is also done then.
As Akldn said, Mania indicated that the wheels are some months away
but welcome orders or EOIs so that they can get info on pricing and availability to those on their list. The same applies to Enkies through the Australian supplier Autotechnik Tuning as they hold little stock in country.