[HoosierDaddy]

https://qualitybusandtruckparts.com/prod...C_u2uuJyfa

Here’s a source for used parts. The 900$ kit I saw was for Kenworth and did not feature the pantograph wiper arms. I’m sure the parts can be sourced individually to better fit your use.
I get the sticker-shock.

[TerryW]

(Whew, I need to get a pacemaker after that sticker shock.)

I don't know but $900 for all that looks pretty good. I just paid $600 for a 2 sets of brake pads and that was the best price I could find.

I still need to do my brakes, I'm planning on $1k per corner and hopefully it will be less.

[TerryW]

For the older Newell classics, mine is a 1986
AM Equipment for the win!!!
 
Part numbers: 
3051007 Panto Adapter 1.75 O.C.
3520047 Arm Panto Wet 24" Tapered knurl SS
 
Everything bolts right up to the old air motors but you will need a new wiper as the old design doesn't work with the new. Mine were ready to be replaced anyway. Also, the new arm sprays fluid from a lower location on the arm, not really an issue just fyi. The new adapter plate has a larger opening for the motor drive but again no real issue because the provided gasket does a good job of sealing up the smaller shaft to the larger opening. Bolt holes are spot on, and the new panto and the old drive shaft play nice together so all is well there. Also the foot print on the old adapter plate and the new adapter plate are identical so it will cover the same area on your paint and look OEM.  The new arm and adapter plates will not work with the old stuff, the mount is different on the idler arm so you will need both new parts.