A cape has the entire spectrum of sizes BUT the stems are shorter and a single feather will tie fewer flies compared to a saddle feather. The individual barbs also get shorter toward the tip of the feather. The individual barbs are stiffer than saddle hackle barbs. A cape ties much fewer flies in a given size than a saddle.
A saddle had more consistency in barb length so the a saddle will tie hundreds of flies in a given size. Whiting capes are very consistent which means an individual saddle will tie only about 2 sizes of flies. So a saddle might have a few size 14 but mainly 16 and 18s. A true size 12 to 14 size Whiting is very difficult to find. They tend toward the smaller hackle sizes.
I have inspected literally hundreds of Whiting saddles looking for size 12s and 14s with little success. Your best bet is either
Whiting Eurohackle which tends to be larger sizes or the
Whiting "Pro" grade saddles that are actually cheaper because they are have less consistent barb sizes for a given saddle.
Another possibility is the
Hebert-Miner strain of Whiting. These have longer fibers so tie larger flies. They also come in a less expensive
Pro Grade.
With the craze for saddle hackle as a female hair extension, you are going to find it difficult to get saddles, especially Eurohackle and any grizzly saddle.