I believe the original arms and blades for these trucks are pretty easy to spot because they are really light weight items due to the vacuum wiper system. They are out there from the vendors. Very light skinny arms connecting to the center of rigid light blades. They almost appear loose at the connecting as they designed to flop over from side to side. Like littlebuddie and polarcat said they are kinda primitive looking. Most have been replaced over the years to more modern arms and blades and is one reason folks complain that their vacuum systems don't work worth a darn.
