I recommend Specialty Power Windows Inc for their electric wiper kit. They make a kit especially designed for the AD trucks and it is very reliable. It uses an enclosed cable drive system and modern electric motor set up. I have this on a '48 Chevy 1 ton that I use everyday. It's been on the truck for about 4 or 5 yrs now, trouble free. Prior to that I used the New Port electric wiper set up. It never lasted more that 3 yrs, with motor burn out ,switches malfunctioning etc. So after replacing 3 New Port Kits I decided to bite the bullet and spend the big bucks for the Specialty Power Window wiper kit. It's the way to go if you use the truck like I do in rain, sleet, snow, and everything else that New England weather throws at us.