1964 catalina wiper motor
 

Does anyone know what wiper motor interchanges with the original on a '64 Catalina? It seems they are non-existent.

With or without overlapping wipers??

Overlapping

2 speed

part number 4911877
group 10.150
P/8 MOTOR ASM. (two speed)
Fits years 1963, 1964

It appears there are some individual parts of the wiper motor (like the armature) that were also the same for 1961 and 1962, but in those years there wasn't a part number for just the motor - it was lumped together as a unit with the wiper drive assembly. So, it's possible that a 1961/1962 wiper motor may work as well, but that's just a guess.

Sorry, I should have specified, I need the whole wiper motor assembly. I have found one on eBay, refurbished, but they want $800 for it. My question is, would something newer like a 65 through 68, from say a Buick or Oldsmobile work? I'm just looking for something that'll interchange with the original 1964 assembly.

wiper motor
 

1964 Chevy Impala is the same. Restoration of a core is about $375.00. Labor is a big deal as they have to take the end cap rivets off that hold the brush housing to plate the end cap then re-rivet the brush holder back on the end cap. Restored one looks better than NOS

You mean the motor plus the transmission (the part that converts the motor's rotation to back and forth operation? Assuming you just want a setup that's functional and don't need one that's been restored, I'd check in your area for a salvage yard that has older cars in stock. If you can't find one locally, check with Steve Barcak at Pontiac Heaven. He posts here occasionally so you could send him a PM, he also has a website and a Facebook presence.

http://www.pontiacheaven.com
https://www.facebook.com/PontiacHeaven/

Yes, the motor and transmission along with washer pump. The complete wiper motor unit. Referencing my original question, does anyone know of a unit that interchanges with a '64 Catalina? None of the wrecking yards around here have any old Pontiacs, just some Chevs and a couple Buicks of the same year, is why I asked about interchangability. Thanks all for your input.