I am looking at buying a Series III 1976. It looks great, no rust, not perfect, but all there and solid. But it has a 3 bearing diesel and from what I've read they're no good...but are they? Also - the owner said it doesnt have glo plugs, but I believe most automobile diesels do. Looked and it appeared there were glo plugs (wires etc). So - are the 3 bearings bad and is it possible to NOT have glo plugs? Thanks!