Help finding wheel cylinders on 1970 C60

[Nobighurry]

Hey guys - I'm having the brakes redone on my C60 due to a couple leaky wheel cylinders. I was able to find one of the from the casting number at NAPA, but no luck on the other one. I can't find the 19105 cylinder. I found plenty of the 19108. Anybody run into this before? Do you have cross reference numbers? My truck is a heavy medium with Dayton's. I'm looking specifically for the rears.

Thanks!