Like the others suggested, separating the two shouldn't be a very big challenge. The 1230's are pretty basic. U.S. relay controllers from the same period should still be not-too-difficult to cut apart. My experience is with putting them together, not taking them apart. Don't expect to find comprehensive prints like we're used to in the 21st century. Back in the 80's, U.S. would send out a generic print, and it was up to the installer and adjuster to decide how to complete a non-standard installation.