The dag looks pretty rough so I would at least get
all the loose stuff off & coat that. You do have to be sure
that you have a single U shaped pattern. I cant see the
ground, it may be a spring or fingers on the chassis
that touch the dag. So find it & be sure it will contact
the dag.You can probably work around the tags.
It is a rare set, probably $20-$30 more than a series
set, a LOT back then. $20 could get you 3 tanks of gas
( 60 gal ) & a carton of smokes. Now some places you cant
get 2 packs for $20 ! So not many sets sold.
73 Zeno