Yes, but by the time you buy all those parts individually, plus you have to tear it down to change the main shaft, you best look for an open drive trans to start with
We have stacks of the open drive rear supports (aka rear bearing retainer). The key part needed is the open drive mainshaft (7061 in the exploded parts drawings). You need the correct mainshaft to match your 1947 gearset……that would be either the 21C-7061 or the 59C-7061. Those two are interchangeable and just need the correct mainshaft washers to match up the shaft to your existing gearset.
The real problem is finding a good used open drive mainshaft. They were never reproduced. Finding an NOS shaft is the proverbial needle in the haystack. The average used shaft has wear on the pilot end……wear that might be acceptable or not. We rarely have these available to resell since they are usually needed in our own shop for rebuilds. If you can find the entire transmission, you’d be money ahead.