Which modern wiper motor?

Hi Guys, I know this is a pretty old thread but I was hoping for some help. I am currently installing an Apache crate Hemi into a 67 cuda and I have found I will have to shave the firewall where the wiper motor is and move it under the dash. The charger wiper motor looks interesting but I can't find one at a parts store ( ex Napa ) that includes the splined arm or a wiring harness. Anybody know where I can get those new (not from a wrecker). Hoping not to have to tear a dash out of wreck to get at the wiper motor. Thanks.