Have just discovered I have two types.
One "one piece" where the entire metal bucket is riveted together, the bucket and the outer flange as an assembly. A second set is two pieces, the two parts are held by the screw at the right/left of the lens. And the outer flange and screw are gold zinc dichromate on the two piece, where on the one piece they are just silver zinc. The screws are different as well, different threads and slightly different heads.
Not sure which set came out of which car but have two Dec 67 San Jose cars, a March 68 San Jose and a May 68 Dearborn car.
Anyone know which style belongs with which plant/time period...??