engine and gear box mounts

[Tony Smith]

It is a Junction Box. It seems there were at least two types, the one in the picture, and one in the parts book. The one in the picture may be an automotive part (it's not genuine Ford). It doesn't appear to be alike any of the Vintage Lucas stuff that's available, either.
The one in the parts book looks suspiciously like a domestic metal conduit junction box, for carrying the wiring the wiring in an old house. Don't laugh, as the Inspection Light socket on Aust and NZ Carriers is a Clipsal power point socket, as are the Ignition and Headlight switches! I think Bob Moseley may have a picture of some NOS switches which show they were numbered as carrier parts to confuse the Japanese. I would try asking at Old House Recyclers for electrical metal conduiting, or maybe your local tip has a recycling area, but it may be hard to get as it is now illegal to wire houses with.