But Sunday up in St Germain I did find something kind of interesting, and I beat Rainville to it by just a few minutes!
It appears to have '78 CC rails and rear axle, while the arms appear to be '80s LF. The three idler wheels were what caught my eye, and the aluminum spacers sealed the deal. Chuck had passed on it earlier in the morning, he told me he had enough junk, which was good for me, because I don't feel I do yet.
Note the extra pair of fittings on the rails forward of the front arms, for little idler wheels. '78 front arms would not have the welded on loops on top. A '78 rear arm would not have the idlers mounted to it, those are both newer parts.
The steel bracket at the rear of the rails is riveted on the production rails, but bolted on the CC rails.
Last night, Rainville and I had a '78 skid, and an 80 skid lined up on the bench beside this one. As others have noted, there is little practical difference between the 78 CC and the 80. In other words, not too hard to clone a 78 CC out of a 80.
The first time I saw it was in the back of Brian's truck. 
