They are small bolt pattern. But after looking closer, this is either a really old conversion, or someone made different rotors fit. The center of both front wheels has been opened up (poorly) to accommodate the hub. Looking in the unused holes in the rotor, it was meant for something else, and someone redrilled them for this.
interesting... probably some ford parts that were modified to fit, hence the opening of the wheel register. for a long time the KH rotors were near impossible to get so a lot of people went to great lengths making thing just work.
like others have said, i'd try and clean up what you have and then make a plan from there. it's possible there's still life in there, but be ready to scrap it all and have a contingency plan in place.