Mike, I bought one of the common electric motors from a seller on eBay years ago and then I wrote a circuit for intermittent wipers (4 speeds plus low, high and off). That circuit is around here somewhere in case you change your mind. I posted it along with all the development as I wrote it. All the original linkage worked fine.
I grew up with vacuum wipers also. Not my fondest memory as I lived in a mountainous area and we all know what mountains do to vacuum. Good luck!
