Dimensions/location of trailing arm mount (LWB)

[wkrtsm]

I'm converting a SWB ('68) to LWB, and already have a used pair of LWB steel trailing arms and cut off the SWB trailing arm mounts on the torsion tube. Since I don't have a LWB car, and since weld-in aftermarket LWB trailing arm mounts cannot be purchased some questions are:

-what's the angle of the trailing arm bolt in the mounts relative to the torsion tube? (maybe 10 or 15 degrees)

-is the height of the bolt in the trailing arm mount centered or offset toward the top - the same way the SWB mount is?

-how many inches (mm) is the inside edge (transaxle side) of the trailing arm mount from the center of the torsion tube?

p.s. the only background info I could find regarding an image of differences (not specific dimensions) is the pic below of a LWB torsion tube (top), and SWB torsion tubes (bottom). But this provides no information that's helpful for fabricating new LWB mounts.