Yeah, I remember this when I was kid working on my old '56 Plymouth (it was 30+ years old then). I dunno, but I'd guess it's would be most likely still common with big rigs if anyone, so Ige probably will know.
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
“Anyone who believes in indefinite growth in anything physical, on a physically finite planet, is either mad or an economist.” -- Kenneth E. Boulding