Several different designs. Keep in mind they made shocks for several different makes and for many years. I am guessing the one in the first pic is 33-34, but that is only a guesse. Rod
There's a good description of Houdaille shocks in the judging standards with pics of about 16 different styles...but alas my copy is at work.
Your shock with the wide ears is aprox early 31 & later (maybe Feb31)?
Pictured below is a Houdaille made shock, probably like yours. This one has a cast base, while some came with a forged base.
Model A shocks were made by 3 other companies as well...Acme,Spicer & Ford.
They all said Houdaille on the covers but had various changes in the adjustment needles, bases and of course the covers.
Say if you're tossing that puppy out...there's still room on my cart!