I was searching for a working 2 speed wiper motor with washer for my 62. The last time I saw one was Impala Bob's, before they went under and the price was around $895 US with all the additional fees. I checked Classic Industries who use to have a listing but no longer. Even though NAPA didn't have anything in their system for one, I reached out to my NAPA friend, Chester, NS, who agreed to send my old one away for a quote to have it rebuilt. It was going to cost me $20 to send it out and $20 to get it back if I didn't like the quote. It came back all rebuilt without getting a quote. Retail was $299 + $43 freight. I know wiper motors for other years are much cheaper but based on the US price I came away feeling like I got a steal of a deal. The main point I wanted to make is, if you need a part and can't find it or don't like the price don't overlook trying something like this.
I would think they would rebuild any core, the inside wouldn't be that different. The box says A1cardone their website is www.cardone.com I don't know if they deal with the public but it may help your local NAPA store reach out. If you experience local difficulties let me know and I'll see if something can be worked out from this end.