McGaughy drop spindles from ECE?

[HookEm67]

Finally found time to start install of 3.5/5 drop/disc brake conversion kit from ECE on my 67. Rear drop kit went on without a hitch. Ran into a situation on the drop spindles. The upper a arm hits the spindle and the upper ball joint doesn't seem to fit right. The spindles say "classic drop" 6072L and 6072R. All signs point to these being McGaughy spindles instead of ECE? Is that common practice for them? Nothing was mentioned when I ordered. And of course this comes to light on a Sunday so they're not open.