Thermostat housing different sizes...

So what does this mean then?:

View attachment 1716068628
& what's the difference???
170/SB/383(&400) VS 225 would be the height of the outlets in relation to the rad tanks, but with Slantys, the straight-up should simply be a vertical hose dimension change. Where are the "straight" outlets in the listings?
P.S. there are A/C & non-A/C specific housings for some applications.