Push-Button Transmission Wanted

As far as I know, the '65 and earlier slant 6 904's were all the same length and all had a bolt on rear flange for the driveshaft. Using a '65 model for the earlier years required some cable shift parts to be swapped....maybe the whole valve body....I can't remember exactly. It was because the cable movement was slightly different. IIRC, the early '60 uses a different converter, so, you'd have to include that in a swap and not use your old one. It's a good idea to use the converter that comes with the transmission anyway just in case the old converter has a problem or metal filings in it that might damage the new transmission.