This question cannot be answered with the information given (need exact model). You can look it up yourself using the link in sources and related links below.
All 1994-2001 Dodge Ram Series Pickups take 20" replacement windshield wiper blades on both sides front.
Length is not an issue but attachment is. You need a wiper that adapts to a "2 screw bayonet" arm. See Sources and Related Links below for one option.
The 1994 Toyota Corolla takes 20" drivers and 18" passenger side wiper blades. See sources and related links below. Do not buy wipers just by length however, and be sure to lookup exact wiper blade part numbers for the brand wiper you decide to purchase by vehicle make, model and year. This ensures correct length AND attachment.
21mm socket or wrench
Wiper blade size varies depending on the exact model of the 1970 Ford Pickup. See Sources and Related Links below to look it up by model.
It's a 20 in. wiper blade
19" & 17"
The 1994 Chevrolet Cavalier has 17-inch wiper blades on both sides. It is important to consider not only the size of the wiper blades but also the attachment piece as they vary in size as well.
The 1999 Toyota Corolla takes 20" driver side and 18" passenger side wiper blades.
The 1997 Ford F-Series Pickup takes 22" replacement wiper blades on both sides front.
4 ohms
The 2003-2008 Dodge Ram Series Pickup takes 24" replacement windshield wiper blades on both sides front.