1972 Barracuda
CTS V modified/upgraded IRS converted to coilovers with a Quickchange, using upgraded SKF X tracker bearing 33 spline 4.75"BC hubs, now(?) being redrilled to 4.5" BC.
I'm currently heading down the path of fabbing some custom 7075 front uprights for an identical front bearing package, also redrilled. These X trackers do have limited track lifetimes, but seem to be the best available presently.
The 20x12 square wheel package for a 600+HP road race 3,000lb car at my home track of Sebring, which is really a demolition derby course built in 1941, seems to want a 5x5 front hub set-up, that is difficult to achieve squarely with all the above, and hence the point of this thread.

Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.