47-55.1 55 years ago I was given this USAF 54 3100

[vintovka]

I used the common 12 volt conversion from one of the big vendors. Cost about $150 with all the discounts and still needs work. They don't tell you that you need to drill the old rubber grommets out completely to install. I do not like the way it sounds and the fit of the motor to the wiper arms seems sloppy. May add extra washers or double up on the spring retainers (have an extra). BTW the one that came with broke immediately.