So, I just went through a strange little rigmarole I thought I would document it in case it helps anyone else.
After I showed my recently acquired 3/8-inch drive Cub box (5295) and my Cub collection and the few pieces I still needed upthread, Don (d42jeep) alerted me to an issue he observed with Cub speeders. Namely, that they are not all the same. And, more specifically, that a chrome-plated (and probably post-war era) 5280 he has will not fit in a pre-/early war box (PLOMB, no "5295" on lid, pre-1943 handle holders) that he has.
Here's a very telling photo he sent me.
The 5281 (14" long) at the very bottom can be ignored. Look at the two 5280's, though. The OAL (18") is the same, but the shape of the swing and the length of the shank between the end of the knob and the first bend in the swing are much different. One can look at that and think about the extra tray in a Plomb Cub box and see how the one in the middle might be a problem fitting.
I was worried about the opposite problem, though. My box is clearly postwar. (It was originally red.) I believe it is the same exact box as the mid- to late-war box, as it has the same shape, layout, and handle as the 5295's shown in all the catalogs between 1943 and 1948, and it has the same exact dimensions. And Don informed me that his wartime era 5280's
will fit in a postwar (red) 5295 box he has. But I was still feeling a little squirrely.
So I texted tin medic, gave him a quick sitrep on the speeders-and-box issue, sent him my critical 5295 box measurements, and asked him to measure the WF-23 he has for me. Turns out - in typical tin medic fashion - that he has four (4) of them.

And, lo and behold, they are not even close to being exactly the same shape, either!
One can clearly see that the swings are not the same, and two of them have a longer shank between the knob and the first bend in the swing.
According to tin medic, the second and fourth speeder will not fit in a 5295 box. At least not in
my 5295 box, which has 3-1/8" of clearance between the corner of the box and the corner of the swivels tray.
So, I am opting for WF-23 #3. I size-matched his speeders image and my box image, proportionally, using the OAL of the box (18-1/2") and his speeder (18"), and then did some outline formfitting. WF-23 #1 may have also fit, but I think WF-23 #3 will fit best.
I am guessing that all these variations are due to multiple factories and loose specs (at least where the first bend and the shape of the swing arm is concerned). I wonder how many times a soldier or ground crew airman cursed when his replacement speeder didn’t fit in his box?
