[TerryW]

This is what i'm dealing with. the small idler size is 10-32, I'm not sure about the larger drive size, it's three towns away in storage right now. The air motor is stamped APMP 664-2 if that helps. Maybe I could turn down a tiny piece of 10-32 rod coupling??? Hmmm....

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(When I stopped to remove the drinker’s side) Now this brought a laugh!

I have been using AI more and more. I wish AI could do this brake job for me on this bus of ours but this is what it says. 

Where to Look for Vintage Wiper Parts

Newell Coach Parts: Even for older coaches, Newell Coach maintains records and custom fabrication support. You can call their parts desk directly at 918-542-3344 ext. 228.

AM Equipment: They supply OEM wiper motors, arms, and linkage components for heavy-duty and vintage motorhomes. You can contact their technical support at 541-327-1546 to match old stud and thread patterns.

AutoTex OEM / Wiper Technologies: They specialize in replacement wiper assemblies, arms, and hard-to-find hardware for older commercial and RV chassis.Heavy-Duty Truck/Fleet Suppliers: Stores like FleetPride often carry commercial-grade wiper studs, knurled adapters, and retaining nuts.

RV Salvage Yards: Midwest salvage liquidators (such as Visone RV or Colaw RV) often part out vintage motorhomes like classic Newells and Foretravels.If you know the thread size or whether the wiper system is air-driven or electric on that 1986 model, I can help narrow down the exact manufacturer part number.

I'm going to take you up on this, thanks.  At this point I am thinking about replacing with newer stuff, maybe electric. The switches on the dash are already problematic