[Accrs-ho] Kadee couplers for passenger cars

[ACCRS HO Scale]

Hey there,

What type of Kadee couplers are we recommending for passenger cars these days? I used to get #5 couplers for rolling stock, but I seem to recall that passenger cars need a different model. 

I just got a bunch of Walthers Proto and Broadway Limited passenger cars, and want to be sure they are properly outfitted for our layout.

Thanks folks.

-Wayne