Wilwood Brake Upgrade

[Nele15]

I am rebuilding a 1972 Blazer and attempting to upgrade the front discs to Wilwood D52 calipers on what I think is an original Dana 44 axle. For whatever reason the calipers don't bolt in directly. I plan on replacing the single piece axle hubs and rotors.

The current rotors are12" and 1.195 thick.

Has anyone run into issues with this and figured out a solution? Perhaps some specific individual rotor and hubs that you used, a different mounting bracket? I'm running out of ideas.

Thanks