Modification of K-member idler arm mount advice

So not to hijack but cn the earlier 66 k frame be converted to the double shear set up?

I sort of did that. By sectioning a '73+ spool mount /6 k-frame and moving the motor mounts, I got a k-frame with the better idler, spool mounts and a through k-frame sway bar. Bolted it in but never drove it, car ended up getting crushed. But I did save the k-frame.