Temporary filter
Actually, the simplest thing to do for a filter for now is to take the working filter out of the 1963 KM 70, Kevin.
When I worked on the '63 last April, the filter was already bypassed, and just sitting there. I got some large lint clods out of it, and un-bypassed it. Whoever did that bypass cut at least one of the hoses, which I had to mend. Instead of doing a repeat of that, if you want to swap the filter for a while, that'd be the easiest thing. Since the 63 70 needs its centerpost POR15'd BADLY anyway, and we need to solve that pesky leak, its not good for much right now, so the filter might as well be used in the '65.
I think your washer service buddy we visited who had the stach of old parts has one of these, but that's just a hunch.
Gordon