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Re: what's the little plastic thing on the end of the wiper arm?
While I can't claim to be an expert, I have actually worked for a windshield wiper manufacturer.
There are a few different styles of connections that came before the standard "hook" style...the "pin" and the "bayonet" type.
The pin style has a big metal stud with a rounded end that sticks out 90° from the arm. The blade has a big hole that the pin fits through.
What I believe you have described is a screwed on bayonet style. This is basically a straight wiper arm tip with a raised nub and two screw holes. What you need is the wiper arm bayonet adapter.
I'm not sure that will be an OEM part, but some replacement wiper blades do come with new adapters (TRICO "Exact Fit" comes to mind, though it's name is a misnomer), though not necessarily to convert from bayonet to pin. Most adapters will adapt to the standard hook style nowadays. Hope this helps!
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Current Garage:
2003 Pontiac Vibe 1.8L AWD
2003 GMC Envoy XL (aka "fat-a$$") - K&N air filter, otherwise stock.
1995 Chevrolet C2500 2wd, 5.7L - K&N air filter, otherwise stock...my weekend hauler.
1992 Toyota Camry LE 2.2L - K&N air filter.
Vehicle History:
2004 4.7L Dakota Quad Cab 4x4
1996 GMC Jimmy 4wd
1992 Chevrolet S10 Ext. Cab 4.3L
1995 Honda ST1100...my first (and only) new vehicle.
1980 Yamaha XS400
1980 Mercury Bobcat...my first car.
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