The "old reliable"(?) MP SFI 8-bolt flexplate is apparently no longer offered, but I don't recall people complaining about them cracking.

The B&M 8-bolt flexplate doesn't appear to have much meat around the 7/16" converter bolt holes and, IIRC, has been known to crack as result of this.

I saw something about the Reactor brand, but those are aluminum and I'd think would have more potential for bolt-hole elongation issues (an unwarranted concern?).

What are the reliable 8-bolt flexplates available today?